MULTIPROTOCOL SERIAL COMMUNICATIONS INTERFACE (SCI-M)
MULTIPROTOCOL SERIAL COMMUNICATIONS INTERFACE (Cont’d)
RECEIVER BUFFER REGISTER (RXBR)
R248 - Read only
TRANSMITTER BUFFER REGISTER (TXBR)
R248 - Write only
Reset value: undefined
Reset value: undefined
7
0
7
0
RD7
RD6
RD5
RD4
RD3
RD2
RD1
RD0
TD7
TD6
TD5
TD4
TD3
TD2
TD1
TD0
Bit 7:0 = RD[7:0]: Received Data.
Bit 7:0 = TD[7:0]: Transmit 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
Register at the end of the word. All receiver inter-
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”.
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: RXBR and TXBR are two physically differ-
ent registers located at the same address.
Note: TXBR and RXBR are two physically differ-
ent registers located at the same address.
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STMICROELECTRONICS [ ST ]
