M16C6KA_15 Datasheet, PDF (87/270 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Description

M16C/6KA Group
Serial I/O
Serial I/O
Serial I/O is configured as three channels: UART1, S I/O3 and S I/O4.
UART1
Fig.GA-1 shows the block diagram of UART1. Fig.GA-2 shows the block diagram of the transmit/receive
unit.
UART1 has two operation modes: a clock synchronous serial I/O mode and a clock asynchronous serial I/O
mode (UART mode). The contents of the serial I/O mode selection bits (bits 0 to 2 at address 03A816) deter-
mine whether UART1 is used as a clock synchronous serial I/O or as a UART. Although a few functions are
different, UART1 has almost the same functions.
Table.GA-1 shows the functions of UART1, and Fig.GA-3 to GA-7 show the registers related to UART1.
Table.GA-1 Functions of UART1
Function
CLK polarity selection
UART1
Possible (Note 1)
LSB first / MSB first selection
Possible (Note 1)
Continuous receive mode selection
Transfer clock output from multiple
pins selection
Serial data logic switch
Possible (Note 1)
Possible (Note 1)
Possible
TxD, RxD I/O polarity switch
Possible
TxD, RxD port output format
CMOS output
Note 1: Only in clock synchronous serial I/O mode.
Rev.1.00 Jul 16, 2004 page 85 of 266
REJ03B0100-0100Z