7906 datasheet(280/531 Pages) RENESAS

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7906 Group User’s Manual Rev.2.0

11-39

SERIAL I/O

11.4 Clock asynchronous serial I/O (UART) mode

11.4.2 Transfer data format

The transfer data format can be selected from formats shown in Figure 11.4.2. Bits 4 to 6 at addresses

3016 and 3816 select the transfer data format. (See Figure 11.2.2.) Set the same transfer data format for both

transmitter and receiver sides.

Figure 11.4.3 shows an example of transfer data format. Table 11.4.5 lists each bit in transmit data.

Transfer data length of 7 bits

1ST—7DATA

1SP

1ST—7DATA

2SP

1ST—7DATA—1PAR— 1SP

1ST—7DATA—1PAR— 2SP

Transfer data length of 8 bits

1ST—8DATA

1SP

1ST—8DATA

2SP

1ST—8DATA—1PAR— 1SP

1ST—8DATA—1PAR— 2SP

Transfer data length of 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

Fig. 11.4.2 Transfer data format

Name

Start bit

DATA

Character bit

PAR

Parity bit

Stop bit

Functions

“L” signal equivalent to 1 character bit. This is added immediately before the character

bits. It indicates start of data transmission.

Transmit data which is set in the UARTi transmit buffer register.

A signal that is added immediately after the character bits in order to improve data

reliability. The level of this signal changes according to selection of odd/even parity

in such a way that the sum of “1”s in the sum of this bit and character bits is always

an odd or even number.

“H” level signal equivalent to 1 or 2 character bits. This is added immediately after

the character bits (or parity bit when parity is enabled). It indicates completion of

data transmission.

Fig. 11.4.3 Example of transfer data format

Table 11.4.5 Each bit in transmit data

Time

• 1ST–8DATA–1PAR–1SP

LSB

MSB PAR

Transmit/Receive data

DATA (8 bits)

Next transmit/receive data

(When continuously

transferred)

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