M16CSLASH62M datasheet(391/615 Pages) RENESAS

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UART

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-74

2.5 Clock-Asynchronous Serial I/O (UART) Usage

2.5.1 Overview of the clock-asynchronous serial I/O usage

UART handles communications by means of character-by-character synchronization. The transmission

side and the reception side are independent of each other, so full-duplex communication is possible. The

following is an overview of the clock-asynchronous serial I/O usage.

(1) Transmission/reception format

Figure 2.5.1 shows the transmission/reception format, and Table 2.5.1 shows the names and func-

tions of transmission data.

Figure 2.5.1. Transmission/reception format

Transfer data length : 7 bits

1ST – 7DATA

1SP

1ST – 7DATA

2SP

1ST – 7DATA – 1PAR – 1SP

1ST – 7DATA – 1PAR – 2SP

Transfer data length : 8 bits

1ST – 8DATA

1SP

1ST – 8DATA

2SP

1ST – 8DATA – 1PAR – 1SP

1ST – 8DATA – 1PAR – 2SP

Transfer data length : 9 bits

1ST – 9DATA

1SP

1ST – 9DATA

2SP

1ST – 9DATA – 1PAR – 1SP

1ST – 9DATA – 1PAR – 2SP

: Start bit

DATA : Character bit (Transfer data)

PAR

: Parity bit

: Stop bit

Name

Function

ST (start bit)

DATA (character bits)

SP (stop bit)

A 1-bit “L” signal to be added immediately before character bits.

This bit signals the start of data transmission.

Transmission data set in the UARTi transmit buffer register.

A signal to be added immediately after character bits so as to increase data

reliability. The level of this signal so varies that the total number of 1's in

character bits and this bit always becomes even or odd depending on which

parity is chosen, even or odd.

PAR (parity bit)

Either 1-bit or 2-bit “H” signal to be added immediately after character bits (after

the parity bit if parity is checked). This / they signals the end of data

transmission.

Table 2.5.1. Transmission data names and functions

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