7751 Datasheet, PDF (159/540 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

SERIAL I/O
7.1 Overview
This chapter describes the Serial I/O.
The Serial I/O consists of 2 channels: UART0 and UART1. They each have a transfer clock generating timer
for the exclusive use of them and can operate independently. UART0 and UART1 have the same functions.
7.1 Overview
UARTi (i = 0 and 1) has the following 2 operating modes:
qClock synchronous serial I/O mode
Transmitter and receiver use the same clock as the transfer clock. Transfer data has the length of 8 bits.
qClock asynchronous serial I/O (UART) mode
Transfer rate and transfer data format can arbitrarily be set. The user can select a 7-bit, 8-bit, or 9-bit
length as the transfer data length.
qClock synchronous serial I/O mode
Transfer data length of 8 bits (LSB first)
Transfer data length of 8 bits (MSB first)
qUART mode
Transfer data length of 7 bits
Transfer data length of 8 bits
Transfer data length of 9 bits
Fig. 7.1.1 Transfer data formats in each operating mode
7–2
7751 Group User’s Manual