Communication Processor Module
16-220
MPC823e REFERENCE MANUAL
MOTOROLA
COMMUNICATION
16
SCCs
TPM—Transmitter Parity Mode
This field selects the type of parity that the transmitter performs. It can be modified
on-the-fly.
00 = Odd parity.
01 = Force low parity. Always send a zero in the parity bit position.
10 = Even parity.
11 = Force high parity. Always send a one in the parity bit position.
16.9.15.16 SCCx UART RECEIVE BUFFER DESCRIPTORS.
On a per-buffer basis, the
communication processor module uses the receive (RX) buffer descriptors to report
information about the received data. The communication processor module closes the
current buffer, generates a maskable interrupt, and starts receiving data into the next buffer
after one of the following events occur:
• A user-defined control character is received.
• An error occurs during message processing.
• A full receive buffer is detected.
• A MAX_IDL number of consecutive idle characters is received.
• The
ENTER HUNT MODE
command is issued.
• The
CLOSE RX BD
command is issued.
An address character is received in multidrop mode and is written to the next buffer for a
software comparison.
An example of the RX buffer descriptor process is illustrated in Figure 16-76.
Note:
The receive parity errors can be ignored, but not disabled.
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.
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