MPC823 datasheet(18/74 Pages) MOTOROLA

18 / 74 page

Communication Processor Module

16-396

MPC823 REFERENCE MANUAL

MOTOROLA

PM—Parity Mode

0 = Odd parity.

1 = Even parity.

SM—SMCx Mode

00 = GCI or SCIT support.

01 = Reserved.

10 = UART mode (must be selected for SMCx UART operation).

11 = Totally Transparent mode.

DM—Diagnostic Mode

00 = Normal mode.

01 = Local loopback mode.

10 = Echo mode.

11 = Reserved.

TEN—SMCx Transmit Enable

0 = SMCx transmitter disabled.

1 = SMCx transmitter enabled.

REN—SMCx Receive Enable

0 = SMCx receiver disabled.

1 = SMCx receiver enabled.

16.11.6.11 SMCx UART RECEIVE BUFFER DESCRIPTOR. Using the buffer descriptors,

the communication processor module reports information about the received data on a

per-buffer basis. It then closes the current buffer, generates a maskable interrupt, and starts

receiving data into the next buffer when one of the following events occurs:

• An error is received while a message is being processed.

• A full receive (RX) buffer is detected.

• A programmable number of consecutive idle characters are received.

Note:

The communication processor module sets all the status bits in this buffer

descriptor, but you must clear them before submitting the buffer descriptor to the

communication processor module.

OFFSET + 0

RES

RESERVED

RES

OFFSET + 2

DATA LENGTH

OFFSET + 4

RX DATA BUFFER POINTER

OFFSET + 6

NOTE: You are only responsible for initializing the items in bold.

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