uPD98201 (S-Interface Transceiver I.430)

When the uPD98201 is used in the TE mode, does the 64 kHz output from BCLK become unsynchronized with RSYC when the line is disconnected?
Or does the output itself stop?

If the state is other than line synchronization, synchronization is lost, so a free-running clock is output without synchronization with RSYC.

Software reset can be set with command 43H, but what is the procedure for releasing software reset?
Can it be released by command, or is it automatically released following the lapse of a certain time?

Reset release is automatically performed internally.

Moreover, the reset time by command is double the time required for RESET input, thus 10.4 us.
This LSI does not have a function to notify reset release to external, so implement software wait on the CPU side.

I use the uPD98201 in the TE mode. Does the uPD98201 support 1 multi-frame with 20 frames?
If so, how is pin symbol FAIN used?

Which of "L" or "H" should the FA bit (Q bit) be set to?
If multi-frame is not supported, which should be set?

Loading and latching are performed at every frame, and that logic is applied to the relevant bits.
The usage method is to be determined by the customer.
If multi-frame is not used, input "L".

Does the uPD98201 comply with CCITT Recommendation I.430a? Is dedicated line support possible?

The uPD98201 is an interface LSI that complies with CCITT Recommendation I.430 (1986).
It will operate even for dedicated lines as long as the operation is within CCITT Recommendation I.430.