7477 datasheet(124/361 Pages) RENESAS

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7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.13 Serial I/O

2 Transmit/receive data format

A transmit/receive data format can be selected by the bits of the UART control register (UARTCON).

• Start bit (ST)

: 1-bit

• Data bit (DATA) : 7-bit or 8-bit

• Parity bit (PA)

: Non or 1-bit

• Stop bit (SP)

: 1-bit or 2-bit

Figure 1.13B.7 shows a transmit/receive data format, Table 1.13B.4 shows a function of each bit of

transmit data, and Figure 1.13B.8 shows all data formats.

Fig. 1.13B.7 UART data format

Table 1.13B.4 Each bit function of UART transmit data

Name

Start bit ST

Data bit

DATA

Parity bit

Stop bit SP

Function

The “L” signal for 1 bit is added by the bit indicating a start of data transmission

immediately before the transmit data.

This bit indicates the transmit data written in the UART transmit buffer register.

The “0” data is an “L” signal and the “1” data is an “H” signal.

This bit is added immediately after the data bit for improvement of data reliability.

The contents of this bit change according to the contents of the parity selection bit

so that the number of “1”s in the transmit data including the parity bit may always be

even or odd.

This bit indicates that data has been transmitted, and is added immediately after the

data bit (immediately after the parity bit when the parity is valid). The “H” signal for

1 bit or 2 bits is output.

q For 1ST-8DATA-1PA-2SP

LSB

MSB

Transmit data

Data bit (8 bits)

Next transmit data

(at continuous output)

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