UPD784938 Datasheet, PDF (432/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 18 ASYNCHRONOUS SERIAL INTERFACE/3-WIRE SERIAL I/O
18.2.2 Asynchronous serial interface control registers
(1) Asynchronous serial interface mode register (ASIM), Asynchronous serial interface mode register 2 (ASIM2)
ASIM and ASIM2 are 8-bit registers that specify the UART mode operation.
These registers can be read or written to with an 8-bit manipulation instruction or bit manipulation instruction. The format
of ASIM and ASIM is shown in Figure 18-3.
RESET input clears these registers to 00H.
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Preliminary User’s Manual U13987EJ1V0UM00