NEC PD78214 - Manual (Page 285)

256
µ
PD78214 Sub-Series
9.5.2 Example of Setting the Baud Rate When 8-bit Timer/Counter 3 Is Used
Table 9-4 lists examples of setting the baud rate when 8-bit timer/counter 3 is used. When using 8-bit timer/
counter 3, reset the SCK bit of the asynchronous serial interface mode register (ASIM) to 0.
See Section 7.4 for how to use 8-bit timer/counter 3.