Remote control transmitter device..uPD6x

Please describe the preamplifier used for remote control reception.

NEC provides the uPC2800A.

Do the uPD6134 and the uPD61P34B have similar oscillator circuits?
Do I have to match to a new resonator when changing from the uPD6134 to the uPD61P34B? If matching evaluation is required, can you provide any samples for evaluation?

A matching check is required using the uPD61P34BGS.
Samples for matching checks are available on loan. Contact your local sales representative.

When using a POC circuit, if the power supply varies between the Vpoc cancellation voltage and the guaranteed operating voltage, can this cause operation faults? For example, what if VDD changes from 3 V to 1.9 V and then back to 3 V?

Yes, that can cause operation faults.
The specifications for the POC detection voltage suggest that POC detection may fail when VDD = 1.9 V, and oscillation may be stopped when the power supply voltage is low.

A caution point under "5.2 Setting and Releasing Standby Mode" in the uPD65A/65's data sheet says that the STTS #05H instruction must be executed before the HALT #05H instruction. Is that correct?

That caution point does not mean that the STTS #05H instruction must be executed before the HALT #05H instruction. Instead, it means that setting of status flags (to 1) right before the HALT instruction is actually executed should be avoided.
One way to avoid this is to execute the STTS instruction to clear the status flag (to 0) just before executing the HALT instruction.

Remark
The STTS instruction is required just before executing the HALT instruction only in cases where the HALT instruction cannot be executed as expected due to dependence on the status flag (F) setting just before it is executed.BR> When the status flag value is 0, standby mode can be set by the HALT instruction. When the status flag value is 1, it guards against standby mode being set unintentionally.

What is the capacitance of the oscillator's capacitor that can be set as a mask option in uPD67, 68, and 69 Series devices?

It is about 15 pF (typ.)

Please explain how I can remove carrier components.

For a description of removing carriers via software, see "4.3.2 Carrier output control" in the data sheet. Also, see "Table 4-2. REM Output."

When I set the system clock frequency as 4.19 MHz, the duty ratio as 50%, and the carrier frequency as 40 kHz and then measure the carrier, it is about 80 us shorter during ON mode than during OFF mode.

Your 40-kHz/50% settings do not work under these conditions, so the results contain errors.
As is noted in the data sheet, the timer's error margin is one count per 64/fx. Although the precision of the oscillation frequency is not known, when checking precision we recommend checking the time at the /LED pin's output before checking the carrier-related output.

When USECAP (an internal capacitor for oscillation) is specified by a mask option for an assembler (AS6133 V2.20) that supports the D68MC, an assembler error occurs. Is there any way to specify this other than the way described in the preliminary product information?

AS6133 V2.20 does not support USECAP.
Use V2.21 or later instead.

The addresses in the PRO file output by AS6133 do not match the addresses in the assembly list. It seems they exceed the device's address.

The uPD69's object code has 10 bits per word. The AS6133 expands a 10-bit code to 16 bits before outputting it, so addresses in the PRO file are exactly doubled.

Reference document:
uPD67, 68, 69 Data Sheet
  9.1 Machine Language Output by Assembler