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Microcompter Device FAQ What's new
2008/02
V850 : Ratings
 CLKOUT synchronization and CLKOUT asynchronization standards (common to V850)
Common Items : Screening (flash microcontroller and OTP microcontroller)
Screening (flash microcontroller and OTP microcontroller)
Common Items : Power Supply
Regulator
AVref power supply when not using A/D function
78K : Product Differences and Substitutes
Differences between 78K0/Kx2 and 78K0S/Kx1+ (78K0/Kx2, 78K0S/Kx1+)
Differences among 8-bit microcontroller products (78K0/78K0S)
78K : Other..Prohibited Items
What happens when a prohibited value is set to a register?
78K : Memory Allocation.. Directives, LOCATION
RAM area pointed to by 16-bit stack pointer [78K0R]
78K : I2C Bus
What is the simplified I2C? [common to 78K0R]
78K : Flash programming
Conditions of VDD power supply current of flash memory programming characteristic [78K0/Kx2, 78K0/Lx2]
78K : Clock
Is 2.5 V a suitable voltage for the X1 pin of the X1 oscillator? [78K0R/Kx3]
78K : Boot swap function
Boot swap function (78K0/Kx2)
2008/01
Common Items : Oscillation
Matching
Common Items : Kinds of microcomputers
Low-pin-count microcontrollers
All Flash
Names of microcomputers
Common Items : Key Interrupt and Chattering Countermeasures (78K0/Kx2)
Key interrupt and chattering countermeasures (78K0/Kx2)
78K : Decimal calculations with microcontrollers (78K0, 78K0S, 78K0R)
Decimal calculations with microcontrollers (78K0, 78K0S, 78K0R)
2007/11
Common Items : Switching operating clocks at power-on (78K0/Kx2 and 78K0R)
Switching operating clocks at power-on (78K0/Kx2 and 78K0R)
Common Items : Software I2C bus communication program for 78K0S (78K0S/Kx1+ common, program samples are targeted for KY1+)
Software I2C bus communication program for 78K0S (78K0S/Kx1+ common, program samples are targeted for KY1+)
Common Items : Simple ways to use A/D converters (78K0/Kx2, 78K0S/Kx1+)
Simple ways to use A/D converters (78K0/Kx2, 78K0S/Kx1+)
Common Items : Option bytes (78K0/Kx2, 78K0S/Kx1+)
Option bytes (78K0/Kx2, 78K0S/Kx1+)
Option bytes settings (common for 78K0/Kx2, 78K0S/Kx1+)
Common Items : LED drive methods (78K0/Kx2, 78K0S/Kx1+)
LED drive methods (78K0/Kx2, 78K0S/Kx1+)
Common Items : Key switch input in microcontrollers (part 2)
Key switch input in microcontrollers (part 2)
Common Items : Dynamic display methods for LEDs (78K0/Kx2, 78K0S/Kx1+)
Dynamic display methods for LEDs (78K0/Kx2, 78K0S/Kx1+)
78K : Serial Communication
Support for Microwire (common to almost all devices that include CSI)
2007/03
V850 : Pins..DC Characteristics, Pin Handling
Processing of port/control alternate-function pins [V850E/MS1]
Common Items : Table referencing and interpolation processing
Table referencing and interpolation processing (The program example used applies to model 78K0. Everything else applies to the whole series.)
Common Items : Key Switch Input into Microcontroller
Key switch input into microcontroller
2006/05
Common Items : Watchdog Timer
Watchdog Timer Basics
Common Items : Standby Operation
Standby Operation
Common Items : Microcontrollers for control or embedded applications
Microcontrollers for control or embedded applications
Common Items : Microcontroller and memory
Microcontroller and memory
Common Items : Development of microcontrollers
Instructions
78K : Watchdog Timer
Using watchdog timer (78K0/Kx2)
78K : Serial Communication
Usage of Serial Interface with Automatic Transmit/Receive Function (CSIA0) [78K0/Kx]
78K : Reset Pin
Using Reset Pin as Alternate-Function Port [Low-Pin-Count Device]
78K : Product Differences and Substitutes
Differences Between uPD78064, uPD78064B, and uPD780308 Subseries
78K : Memory bank
Memory bank (78K0/Kx2)
2006/04
V850 : Writing to Flash Memory
Tools for writing to internal flash memory [V853]
V850 : Watchdog Timer
Initialization with watchdog timer interrupts [V850/SA, V850/SB]
Starting and stopping the watchdog timer by program
Operation following timeout of watchdog timer [All V850]
V850 : Timer, Counter
I cannot release STOP mode by using an INTP0n0/1 interrupt [V850/SV2]
Pulse width measurement with 8-bit timer [V850/SB]
Timer 2 operation [V850E/1A]
Timer/counter function [V850ES/Kx1]
Using a 16-bit timer as an interval timer [V850ES/Kx1]
Sequence of settings in timer control register [V853]
About settings for interval time
Synchronization of multiple timers (simultaneous count start) [V850E]
Output waveform when CRn0/1 is changed during processing [V850/S]
V850 : Serial Communication
How to use the clocked serial interface with automatic transmit/receive function [V850ES/Kx1]
I would like to transmit data via 3-wire serial communications, but I cannot get any clock output for this. [V850ES/Kx1]
I cannot issue a start condition via the I2C bus [V850ES/Kx1]
Timing of UART transmission interrupts [V850ES/Kx1, etc.]
What is the timing for setting PM22 to "1" during serial communications? [V850E/MS1]
Serial communication reception does not start.
Prewriting 2 bytes of data at transmission start [V850E/MA1]
Cautions regarding power application when performing UART communication between two CPUs
No communication interrupt occurs after data output
When using T02 or T03 as the clock output, can the T02 or T03 output pin be used as a normal port?
Basic operation of 3-wire serial communication (almost all contents common to all devices)
Basic operation of asynchronous communication (almost all contents common to all devices)
V850 : ROM Correction
Details of ROM correction [V850/S]
V850 : Reset
What is the timing for canceling a reset? Is it based on the rising edge or the level?
V850 : Programming
What should be done (commonly) first after reset and start [common to V850]
V850 : Power Supply
What mode reduces the power supply current most? (for lower power consumption)
V850 : Pins..DC Characteristics, Pin Handling
Pull-up resistance values for unused pins and bus lines
Can P00 to P07 be connected to VDD when they are not used? [V850E/MA1]
Maximum value for pull-up resistors
V850 : Other
Image of the internal peripheral I/O area
Composite theoretical performance of uPD703015A (V850/SA1)
V850 : Other Peripheral Functions
Please explain how the system wait control register (VSWC) is used. [All V850E and V850ES]
When using the P111/A1/WAIT pin for wait function, can ports 3, 10, and 11 be used for address output? [V850/SB1]
Can port input data be recognized even when the port has been set to control mode?
Which sampling edge of the WAIT signal is the correct one? [V850E/MA1]
Can an undefined state be avoided by writing a value to a port with an undefined initial value before the undefined port is set to output mode?
V850 : Memory
Is the peripheral I/O register's address FFFFFxxxH? [V850E/MS1]
Can the internal ROM be disabled and an external ROM used instead? [V850/SA1]
V850 : Interrupts
Basic operations of interrupt servicing
Interrupts triggered by software [All V850]
Initialization during interrupt service [All V850]
Interrupts and manipulation of the interrupt control register [All V850]
Bus access and interrupts [All V850]
Interrupt handler address [All V850]
Interrupt occurs during servicing of another interrupt [All V850]
Multiple interrupts [All V850]
Initial interrupt during UART transmission [All V850]
Exception processing of illegal instruction code
Can an interrupt be generated using the external interrupt pin level? [All V850]
Edge judgment method during interrupt [All V850]
Interrupt handler address
Only one interrupt is output.
Interrupts doesn't work. (3) [All V850]
V850 : I2C Bus
Overview of I2C bus
V850 : Execution Time
Programming area that allows the fastest processing
MIPS value calculation
Execution speed [All V850]
V850 : DMA
DMA transfer with I2C bus [V850/SB]
Wait during flyby transfer [V850E/MA, V850E/MS, V850E/ME]
Bus width for flyby transfers [V850E/MA, V850E/MS, V850E/ME]
Endian ordering for DMA [V850E/MA1, V850E/MA2, V850E/ME2]
Misalignment by DMA [V850E/MA1, V850E/MA2, V850E/ME2]
V850 : Difference between PPG output and PWM output
Difference between PPG output and PWM output [contents common to all devices]
V850 : Clock
STOP mode during operation of subsystem clock [Common]
Relationship between reset and clock oscillation [All V850E]
Clock settings in PLL mode [V850ES/SG2, SJ2]
Switching to the subsystem clock [V850/S]
How can I dynamically change the clock in order to reduce power consumption? [V850E/MA1]
How much clock jitter and duty are allowed? [V850E/MA1]
Operation with 6.78MHz external clock [V853]
Can a 5-MHz input be used for the X1 input during PLL mode? [V853]
Relationship between external clock and operating clock [V853]
Can the CERALOCK (resonator) be used in any mode other than PLL mode? [V850E/MS1]
50MHz clock input [V850E/MA1]
Switching time from subclock to main clock [V850]
V850 : CAN
CAN ; Settings in the various registers [V850/SF1]
V850 : A/D, D/A Conversion
Clearing of CE bit of A/D [V853, V850E/MS, V850E/MA, etc.]
Conversion results are unstable (fluctuates to adjacent channel value) [V850/SF1, V850/SA, V850/SB, V850/SC]
The A/D converter value is not correct.
Others : Remote control transmitter device..uPD6x
Are addresses too high in PRO file output by AS6133?
Errors in uPD68's development tool
Precision of uPD67's carrier
Stopping uPD67's carrier
Oscillation capacitance of uPD67
uPD65A's STTS and HALT instructions
Power-on clearing (POC) of uPD62
Evaluation of uPD61P34B's oscillator
Please describe the preamplifier used for remote control reception.
Others : 75XL Series
uPD75P008's ROM programmer products
Software timer speed: can 150 kHz be generated by software?
Voltage when external clock is input to uPD75P3116
Can 75XL development use the EVAKIT-7500/75X?
Upward compatibility of uPD75304
High-level input voltage for uPD75P3036's interrupt port
What is the advantage of using a split resistor for driving the uPD753012A's LCD with the lower resistance?
Differences between uPD75P108 and uPD75P108B
Stop location when executing the uPD75P0016's STOP instruction
Pin voltage is inadequate when using IE for uPD750008
What is the CR value near the uPD750004's oscillator?
Others : 17K Series
Poor contrast in uPD17012's LCD
Common Items : Timer counter
Timer counter basics [Common]
Common Items : Rising/falling of input signal
Standard rise time for interrupts triggered at the input signal's rising edge [Common]
Rising edge/falling edge of signal input to input pin [Common]
Common Items : Remote control
What is the NEC format? [Common]
NEC format for infrared remote control [Common]
Sample program for receiving infrared remote control signals
Standard device for NEC format
Does NEC Electronics make remote control receivers?
How much of an error margin is there for the carrier frequency? [Common]
Use of NEC format
Acquiring a custom code
Common Items : Kinds of microcomputers
On-chip memory in microcontrollers [All microcontrollers]
Types of on-chip ROM in microcontrollers
Bit counts in product names
Common Items : Flash Programming
Connection to flash memory programmer
Does the operation differ for the emulator and flash version?
Flash programming basics
Common Items : Development of microcontrollers
Format for ROM code ordering (Intel hexadecimal format) [Common]
ROMization [Common]
Flow of microcontroller development
78K : Watchdog Timer
Mode upon watchdog timer overflow [All]
Clearing/starting the watchdog timer [All]
Servicing of watchdog timer interrupt [78K0, 78K0S]
Initialization from watchdog interrupt [78K0]
Does the watchdog timer count during the clock oscillation stabilization time?
What is the watchdog timer operation when the STOP mode is released?
Can the watchdog timer operation be stopped and started by program?
What is the restoration time when the reset signal is generated after watchdog timer overflow?
What is the count clock of the watchdog timer?
78K : Timers, Counters
Timer output frequency not as expected [All]
PWM output using 8-bit timer [All 78K0]
Reading 16-bit timer [78K0]
Interrupt at overflow of 16-bit timer [Most 78K0, 78K0S]
16-bit timer interval [78K0S]
No PPG output [All 78K0]
Inversion of ON and OFF times in PPG output [All 78K0 and 78421x]
78K : Serial Communication
Full-duplex/half-duplex communication [common information]
Serial buffer configuration [common information]
Handshake [common information]
Differences between synchronization and asynchronization for serial communication (common information)
Selecting serial I/F [common information]
Concerning internal serial interface of microcontroller [common description]
Support of 300 bps when using UART [All 78K0]
3-wire serial operation [contents common to all devices]
Support for SPI
Recovery processing when transmission is disabled during transmission
Calculation of baud rate when TO1 is selected [78K/4]
Repeated generation of reception completion interrupt if UART input pin remains low level
Procedure for 3-wire serial communication [All]
PM1 mode settings
Initial setting method so that unneeded data is not sent
Slave mode/master mode
Basic operation of 3-wire serial communication (contents common to almost all devices)
Basic operation of asynchronous communication (contents common to almost all devices)
78K : ROMization
What is the -R option for OC78K?
When developing with a flash memory version, is there any problem if the IMS register is set so as to specify a memory size different from that in the final target mask-ROM version?
Can the IMS (memory size switching register) settings be left as they are when mass-producing mask-ROM version?
What device file should be used when mass-producing a mask-ROM version after developing with a flash memory version?
Is it possible to fill unused areas in ROM with a certain value?
Fill characters used for unused areas of ROM
78K : ROM Correction
Details of ROM correction [78K0]
78K : Programming
Processing to be executed first [common to 78K]
The read value differs from the one set to the stack point. [78K0/Kx1, 78K0S]
Table access in 16-bit space
78K : Product Differences and Substitutes
Product names of flash memory versions [78K0/Kx1]
What are the differences between the uPD78F9177 and the uPD78F9177A?
What are the differences between the uPD789114 Subseries and the uPD789114A Subseries?
78K : Noise
Differences between uPD78F0034A and uPD78P018F in noise resistance of interrupt request pins
The harmonic of the power supply current differs from the clock frequency. [78K0]
78K : Memory
Internal EEPROM of microcontroller [common to uPD78986x]
78K : Memory Allocation.. Directives, LOCATION
Using the CALLT area as a program area
Where are registers mapped? [78K0S]
How is word data stored in memory?
Must word data be aligned to even-numbered addresses? [78K4]
When changing a 78K4 device's link directive, must RAM include an SFR area?
Is the base area from 0 to FFFF or from 0 to 1FFFF? [78K4]
Characteristics of LOCATION 0H and LOCATION 0FH [78K4]
MOV instruction that does not affect T registers with LOCATION 0H [78K4]
Must 24-bit instructions be set in order to access RAM for LOCATION 0FH? [78K4]
Operation of MOV A, [HL] at LOCATION 0H [78K4]
Using a device with built-in ROM as external ROM
The message "F206: Segment xxxxxx can't allocate to memory - ignored" is output when linking.
Can variables and code be assigned to memory outside of ordinary memory?
78K : Interrupts
Basic operations of interrupt service
Acknowledgment of interrupt request during macro service execution [78K4]
What do I need to do to write an interrupt request flag in the IF0L register without clearing other flags?
Multiple acknowledgment of same interrupt [78K0]
78K : I2C Bus
Overview of I2C bus
I was able to read the EEPROM without any problem, but have trouble issuing a start condition afterward [Common]
I2C's clock frequency differs from set value [Common]
Difficulties in controlling the I2C bus [Common]
Cannot start I2C bus [78K family]
Example of controlling external EEPROM via I2C bus (for master)
78K : Difference between PPG output and PWM output
Difference between PPG output and PWM output [contents common to all devices]
78K : Clock
Clock switching [uPD780958]
Stoppage of clock [All]
Stoppage of subsystem clock [All 78K0]
Oscillation stabilization time 2 [All 78K]
Stoppage of the main clock
Clock output frequency error [All 78K]
Clock monitor operation [78K0/Kx1]
Clock following stop release [78K0/Kx1]
WTM is set even though the subsystem clock is not connected. Is this a problem?
78K : CAN
About J1850 (CLASS 2) described in uPD780833Y
CAN settings
78K : A/D, D/A conversion
Non-generation of A/D conversion end interrupt [All 78K]
Reference voltage setting [780034A]
Conversion processing time [780034A Subseries]
How to sample 8 analog inputs almost simultaneously [78K4]
What happens if I do not connect the dedicated A/D conversion power supply pins (AVDD and AVSS)?
Can the pins not specified for analog input be used as ports?
Does A/D conversion end by the time specified by the ADM register?
Why do the A/D conversion times described in user's manuals and data sheets differ?
High-speed 6-bit shift method for 10-bit A/D conversion result
8-bit A/D conversion using uPD78F9116 [78K0/S]
2006/03
VR : VRC5477.. (uPD31577; companion chip for VR5432, 5500)
USB controller
VR : VRC4173..( uPD31173 ; companion chip for VR4100 )
USB controller
VR : VR5000/A..( uPD30500/A )
Block write
Startup
VR : VR4310..( uPD30210 )
Hazards
VR : VR4300..( uPD30200 )
Hazards
VR : VR4181, VR4181A..( uPD30181, uPD30181A )
PC card controller
A/D converter and D/A converter
Clock oscillator
Hazards
Power modes
Clock
ISA bridge
Address mapping
USB controller
Touch panel interface
Memory access
VR : VR4133..( uPD30133 )
Supported OS
VR : VR4131..( uPD30131 )
PCI bus interface
Communications control
Hazards
Power modes
Reset
Clock
Memory access
Address mapping
VR : VR4122..( uPD30122 )
Hazards
Reset
Clock
Power modes
VR : VR4121..( uPD30121 )
Hazards
Power modes
Reset
Clock
Compiler
VR : RX4000
FPU instruction
UserPool
System calls
VR : Evaluation Board
RockHopper
VR : Differences of device
VR Series (general)
VR : Common
Shutdown
Initialization
Benchmark performance
2003/05
78K : Power Supply
Separation of A/D power supply from that of digital circuit
2003/01
78K : LCD
LCD controller/driver on MCU
2002/07
78K : Programming
Sample arithmetic operation program for CPUs that do not have a decimal adjust instruction
2002/05
78K : Serial Communication
Baud rate tolerance [78K/0, 78K/4]
78K : Product Differences and Substitutes
uPD78P018F substitute
Cautions when migrating from uPD780034A to uPD780078
78K : Interrupts
Multiple interrupt processing method
2002/04
VR : VRC4173..( uPD31173 ; companion chip for VR4100 )
PCI pull-up connection
V850 : IEBus
"Simplified version" of the IEBus controller
V850 : DMA
DMA transfer mode [V850/Sxx]
2002/03
Common Items : Register Setting Sequence
Serial register setting sequence [78K/0]
Timer control register setting sequence [V853]
Cautions regarding register setting sequence
78K : Memory
External memory expansion
2002/02
V850 : Debug..IE ID
When there is an interrupt request on the in-circuit emulator, the STOP mode is not released. [V850/SA1]
78K : Programming
Can setting-type registers be rewritten using a fixed cycle?
2001/11
V850 : Debug..IE ID
Socket required for V850/SV1 (BGA) development.
V850 : Clock
Proper use of BUSCLK and CLKOUT [V850E/MA1]
78K : Pins..DC Characteristics, Pin Handling
Handling of test pins. Can these pins be pulled down with a 10kΩ resistor?
Why are open-drain pins connected to VDD and not VSS when they are not used?
78K : Other Peripheral Functions
The input port cannot be normally read immediately after setting internal pull-up.
2001/08
VR : VR4111..( uPD30111 ; planed to discontinue)
Software interrupt settings
Common Items : Flash Programming
I want to read the contents written to the internal flash memory.
What should be done when replacing the flash memory version with the mask ROM version?
78K : Watchdog Timer
Branch processing at power-on. (Returning the interrupt function to the initial setting.)
78K : Timers, Counters
The initial counter value becomes 1.
Timer wait without using interrupts
78K : Other Peripheral Functions
What are the differences between INT0 to INT3 in the uPD780021A ?
78K : Memory
Is program execution possible using internal high-speed RAM? [78K/0]
78K : Interrupts
I want to branch to power-on processing (initialize the interrupt function).
Clock when interrupt occurs during HALT using subsystem clock
2001/07
Common Items : Flash Programming
"Target Signature Error" is displayed during programming.
An initialize error is output during on-board programming.
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