M16C6K9_15 Datasheet, PDF (109/294 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Description

M16C/6K9 Group
Serial I/O
Clock synchronous serial I/O mode
Table.GA-3 Specifications of clock synchronous serial I/O mode (2)
Item
Specification
Function selection
• CLK polarity selection
Whether transmit data is output/input at the rising edge or falling edge of the
transfer clock can be selected
• LSB first/MSB first selection
Whether transmission/reception begins with bit 0 or bit 7 can be selected
• Continuous receive mode selection
Reception is enabled simultaneously by a read from the receive buffer register
• Transfer clock output from multiple pins selection (UART1) (Note)
UART1 transfer clock can be chosen by software to be output from one of
the two pins set
_______ _______
• Separate CTS/RTS pins (UART0) (Note)
_______
_______
Each of UART0 CTS and RTS pins can be assigned to separate pins
• Switching serial data logic (UART2)
Whether to reverse data in writing to the transmission buffer register or
reading the reception buffer register can be selected.
• TxD, RxD I/O polarity switching (UART2)
This function is reversing TxD port output and RxD port input. All I/O data
level is reversed.
_______ _______
Note: The transfer clock output from multiple pins and the separate CTS/RTS pins functions cannot be
selected simultaneously.
Rev.1.00 Jun 06, 2003 page 107 of 290