ST92F124 datasheet(231/429 Pages) STMICROELECTRONICS

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MULTIPROTOCOL SERIAL COMMUNICATIONS INTERFACE (SCI-M)

MULTIPROTOCOL SERIAL COMMUNICATIONS INTERFACE (Cont’d)

RECEIVER BUFFER REGISTER (RXBR)

R248 - Read only

Reset value: undefined

Bit 7:0 = RD[7:0]: Received Data.

This register stores the data portion of the re-

ceived word. The data will be transferred from the

Receiver Shift Register into the Receiver Buffer

rupt conditions will be updated at the time of trans-

fer. If the selected character format is less than 8

bits, unused most significant bits will forced to “1”.

Note: RXBR and TXBR are two physically differ-

ent registers located at the same address.

TRANSMITTER BUFFER REGISTER (TXBR)

R248 - Write only

Reset value: undefined

Bit 7:0 = TD[7:0]: Transmit Data.

The ST9 core will load the data for transmission

into this register. The SCI will transfer the data

from the buffer into the Shift Register when availa-

ble. At the transfer, the Transmitter Buffer Register

interrupt is updated. If the selected word format is

less than 8 bits, the unused most significant bits

are not significant.

Note: TXBR and RXBR are two physically differ-

ent registers located at the same address.

RD7

RD6

RD5

RD4

RD3

RD2

RD1

RD0

TD7

TD6

TD5

TD4

TD3

TD2

TD1

TD0

ST92F124 数据表(PDF) 231 Page - STMicroelectronics

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