SN8F5708 datasheet(135/204 Pages) SONIX

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SN8F5708 Series

UART

Datasheet Rev. 2.4

135

S0CON register. These modes can be support in different baud rate and communication protocols.

SM0 SM1 Mode Synchronization

Clock Rate

Start

Bit

Data

Bits

Stop

Bit

UART pins’ mode and

data

Synchronous

Fcpu/12

UTX pin:

P00M=1 and P00=1

URX pin:

Transmitter:

P01M=1 and P01=1

Receiver:

P01M=0 and P01=1

Asynchronous

Baud rate generator

or T1 overflow rate

UTX pin:

P00M=1 and P00=1

URX pin:

P01M=0

Asynchronous

Fcpu/64 or Fcpu/32

Asynchronous

Baud rate generator

or T1 overflow rate

20.2

Mode 0: Synchronous 8-bit Receiver/Transmitter

Mode0 is a shift register mode. It operates as synchronous transmitter/receiver. The UTX pin

output shift clock for both transmit and receive condition. The URX pin is used to transmit and

receive data. 8-bit data will be transmit and receive with LSB first. The baud rate is fcpu/12. Data

transmission is started by writing data to S0BUF register. In the end of the 8th bit transmission, the

TI0 flag is set. Data reception is controlled by REN0 bit and clearing RI0 bits. When REN0=1 and RI0

is from 1 to 0, data transmission starts and the RI0 flag is set at the end of the 8th bit reception.

20.3

Mode 1: 8-bit Receiver/Transmitter with Variable Baud Rate

Mode1 supports an asynchronous 8-bit UART with variable baud rate. The transfer format includes

1 start bit, 8 data bits (LSB first) and 1 stop bit. Data is transmitted by UTX pin and received by URX

pin. The baud rate clock source can be baud rate generator or T1 overflow controlled by BD bit.

When BD=0, the baud rate clock source is from T1 overflow. When BD=1, the baud rate clock

source is from baud rate generator controlled by S0RELH and S0RELL. Additionally, the baud rate

can be doubled by SMOD bit.

Data transmission is controlled by REN0 bit. After transmission configuration, load transmitted

data into S0BUF, and then UART starts to transmit the pocket. The TI0 flag is set at the beginning of

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