ST7MC1K2-Auto datasheet(144/371 Pages) STMICROELECTRONICS

144 / 371 page

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Figure 62.

Word length programming

Transmitter

The transmitter can send data words of either 8 or 9 bits depending on the M bit status.

When the M bit is set, word length is 9 bits and the 9th bit (the MSB) has to be stored in the

T8 bit in the SCICR1 register.

Character transmission

During an SCI transmission, data shifts out least significant bit first on the TDO pin. In this

mode, the SCIDR register consists of a buffer (TDR) between the internal bus and the

transmit shift register (see Figure 61).

Procedure

●

Select the M bit to define the word length.

●

Select the desired baud rate using the SCIBRR and the SCIETPR registers.

●

Set the TE bit to send a preamble of 10 (M = 0) or 11 (M = 1) consecutive ones (idle

line) as first transmission.

●

Access the SCISR register and write the data to send in the SCIDR register (this

sequence clears the TDRE bit). Repeat this sequence for each data to be transmitted.

Clearing the TDRE bit is always performed by the following software sequence:

Accessing the SCISR register.

Writing to the SCIDR register.

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

Bit 8

Start

bit

Stop

bit

start

bit

Idle line

Stop

Bit

9-bit word length (M bit is set)

Possible

parity

bit

Break character

Extra

’1’

Data character

Next data character

Start

bit

Start

bit

9-bit word length (M bit is reset)

Possible

parity

bit

Data character

Next data character

start

bit

Start

bit

Extra

’1’

Start

bit

Start

bit

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

Idle line

Break character

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