Oscillation

What is the resistance of the subsystem clock oscillator of the uPD78F0058 (see below)?

The resistance value depends on the crystal oscillator.
This resistance is inserted in order to prevent oscillation of the crystal resonator at a harmonic.
Oscillation at the targeted frequency is more easily obtained when this resistance is increased, but setting this resistance too high may cause oscillation to stop.
Please determine a suitable resistance value through consultation with the manufacturer of the crystal resonator.

Who is the manufacturer of the oscillator recommended for the uPD78P4038, and what is the capacitance of the external capacitor when using this oscillator?

We recommend the following Ceralock products made by Murata Manufacturing Co., Ltd.
The actual product name may change, so please ask the resonator manufacturer.

Ceralock Product Name	C1	C2	Remark
CSACW32M0X51-R0	6pF	6pF
CSTCW32M0X51-R0	6pF	6pF	internal
CSACW32M0X51-R0	3pF	3pF

For inquiries regarding resonators, please contact the resonator manufacturer directly.
NECEL does not manufacture or evaluate resonators for microcontrollers.

Is there any capacitor constant, etc., for the recommended resonator?

The following information has been obtained from Murata Manufacturing Co., Ltd. regarding the resonator used for the uPD78F4216A.

Ceralock Product Name	C1	C2	Remark
CSTCR4M00G55-R0	39pF	39pF	internal
CSTCR6M00G53-R0	15pF	15pF	internal
CSTLS10M0G53-B0	15pF	15pF	internal
CSTCC3M00G56-R0	47pF	47pF	internal
CSTCR6M14G53-R0	15pF	15pF	internal
CSTCV12M0T54J-R0	22pF	22pF	internal
CSALA12M5T55-B0	15pF	15pF
CSTCC10M0G53-R0	15pF	15pF	internal
CSTCC2M00G56-R0	47pF	47pF	internal
CSTCC8M00G53-R0	15pF	15pF	internal
CSTCV12M5T54J-R0	22pF	22pF	internal
CSTLA12M5T55-B0	30pF	30pF	internal
CSTLS2M00G56-B0	47pF	47pF	internal
CSTLS4M00G56-B0	47pF	47pF	internal
CSTLS6M00G53-B0	15pF	15pF	internal

For inquiries regarding resonators, please contact the resonator manufacturer directly.
NECEL does not manufacture or evaluate resonators for microcontrollers.

What is the recommended oscillator for the uPD784218A?

Information on the resonators made by Murata Manufacturing Co., Ltd. is shown below.
Please contact the manufacturer regarding availability.

Ceralock Product Name	C1	C2	Remark
CSALA12M5T55093-B0	30pF	30pF
CSBFB1M00J58-R1	100pF	100pF
CSBLA1M00J58-B0	100pF	100pF
CSTCC10M0G53093-R0	15pF	15pF	internal
CSTCC2M00G56-R0	47pF	47pF	internal
CSTCC8M00G53093-B0	15pF	15pF	internal
CSTCV12M5T54J-R0	22pF	22pF	internal
CSTLA12M5T55-B0	30pF	30pF	internal
CSTLS10M0G53-B0	15pF	15pF	internal
CSTLS2M00G56-B0	47pF	47pF	internal
CSTLS4M00G56093-B0	47pF	47pF	internal
CSTLS6M00G56093-B0	47pF	47pF	internal
CSTLS8M00G53-B0	15pF	15pF	internal
CSTCR6M00G53-R0	15pF	15pF	internal

For inquiries regarding resonators, please contact the resonator manufacturer directly.
NECEL does not manufacture or evaluate resonators for microcontrollers.

When connecting a resonator to a microcontroller, how much variation is there in the frequency just as a result of the influence from the microcontroller?
(When a single resonator is connected to several microcontrollers, what is the maximum frequency difference?)

Since NECEL does not evaluate oscillation frequency variation, we cannot specify the maximum variation.
This depends on the resonator that is used and the usage conditions.
The following data has been obtained for 5 samples of Murata's CSA12.5MTZ and CSA8.00MTZ tested at 5V.

CSA12.5MTZ	CSA8.00MTZ
12638.705KHz	8025.552KHz
12642.056KHz	8030.990KHz
12613.265KHz	8027.165KHz
12628.658KHz	8024.246KHz
12673.476KHz	8028.727KHz

These results show that the maximum variation is approximately 60kHz at 12.5MHz.
There is a difference in the amount of variation according to the resonator (12.5MHz and 8MHz).
When matching is not possible, the variation may be more than these results show.

In the uPD780058 User's Manual it says, "Connect XT1 to VDD",
but is it possible to connect XT1 to GND instead of VDD?

When XT1 is connected to GND, the internal leakage current is larger than the leakage current when XT1 is connected to VDD. Otherwise, there are no other particular problems functionally.

Is an external resistor required for the oscillator of the uPD78P4038 in addition to the C1/C2 load capacitance?

No.
Since a feedback resistor is built in, no external resistor is required.

This question is regarding oscillation stabilization in the uPD784216.
During operation with the subsystem clock (32.768kHz) and at VDD (4.5 to 5.5V), the oscillation stabilization time is 2 seconds maximum, but is it all right to detect the end of the oscillation stabilization time using a timer?

One method is to wait for the watch timer interrupt that operates with the subsystem clock.
You can either use the interrupt itself, or poll the interrupt request flag.

When the IDLE mode is selected as the standby setting, is it necessary to wait for the oscillation stabilization time to elapse (using NOP instructions, etc.) when the standby setting is released?

No, this is not necessary.
In the IDLE mode, the clock oscillation itself does not stop.
Therefore, it is not necessary to wait for the oscillation stabilization time to elapse.

What is the time required for reset in the uPD784218AY (from when the reset pin level goes low until the oscillation stops)?

Consider it to be approximately 10μs.

What kind of operation results in the uPD789306 when the feedback resistor selection (FRC) is set to 1 (don't use) in the sub oscillation mode register (SCKM), and no resistor is connected externally either?

The subsystem clock cannot oscillate normally.
Moreover, stable oscillation cannot be expected even if oscillation does occur.
Therefore, operation using the subsystem clock is not possible.