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78K FAQ What's new
2008/02
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
78K : Decimal calculations with microcontrollers (78K0, 78K0S, 78K0R)
Decimal calculations with microcontrollers (78K0, 78K0S, 78K0R)
2007/11
78K : Serial Communication
Support for Microwire (common to almost all devices that include CSI)
2006/05
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
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]
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
2002/03
78K : Memory
External memory expansion
2002/02
78K : Programming
Can setting-type registers be rewritten using a fixed cycle?
2001/11
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
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
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