STR720 datasheet(178/401 Pages) STMICROELECTRONICS

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STR720 - UART

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ASCTxBuffer

Address Offset: 04h

Reset value: 0000h

Writing to the transmit buffer register starts data transmission.

Bit 15:9 = Reserved.

Write 0

Bit 8 = TX[8]: Transmit buffer data D8.

Transmit buffer data D8, or parity bit, or wake-up bit or undefined - dependent on the operating

mode (the setting of the Mode field in ASCControl register).

Note

If the Mode field selects an 8 bit frame then this bit should be written as 0.

Note

If the Mode field selects a frame with parity bit, then the TX[8] bit will contain the

parity bit (automatically generated by the UART). A user writing at ‘0’ or ‘1’ of such a

bit will have no effect on the transmitted frame.

Bit 7 = TX[7]: Transmit buffer data D7.

Transmit buffer data D7 or parity bit - dependent on the operating mode (the setting of the

Mode field in ASCControl register).

Note

If the Mode field selects a frame with parity bit, then the TX[7] bit will contain the

parity bit (automatically generated by the UART). A user writing at ‘0’ or ‘1’ of such a

bit will have no effect on the transmitted frame.

Bit 6:0 = TX[6:0]: Transmit buffer data D(6:0)

765432

RESERVED

TX[8]

TX[7]

TX[6]

TX[5]

TX[4]

TX[3]

TX[2]

TX[1]

TX[0]

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