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4~80
B -
BCS Received
The last bytes in the buffer contain the received BCS.
O=This buffer does not contain the BCS.
1 =This buffer contains the BCS.
Bits
9-5 -
Reserved for future use.
DL - DLE Follow Character Error
While in transparent mode, a DLE character was received, and the next
character was not DLE, SYNC, or a valid entry in the control characters
table.
PR - Parity Error
A character with a parity error was received and is the last byte of this
buffer.
CR -
BCS Error
BCS error is updated every time a byte is written into the buffer. The BCS
status bit includes the current byte. By clearing the RBCS bit in the BISYNC
mode register, the user can exclude the current character from the message
BCS calculation. If the current character is a SYNC, the BCS is updated
without writing the SYNC into the buffer.
OV- Overrun
A receiver overrun occurred during message reception.
CD - Carrier Detect Lost
The carrier detect signal was negated during message reception.
Data Length
The data length is the number of octets that the CP has written into this
BD's data buffer, including the BCS (if selected). Data length should initially
be set to zero by the user and is incremented each time a received character
is written to the data buffer.
NOTE
The actual buffer size should be greater than or equal to the MRBLR.
Rx Buffer Pointer
The receive buffer pointer, which always points to the first location of the
associated data buffer, may be even or odd. The buffer may reside in either
internal or external memory.
MC68302 USER'S MANUAL
MOTOROLA
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