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which address character matched the user-defined address character, en-
abling the UART to receive the data.
1 =The address-matched user-defined UADDR 1
0 =The address-matched user-defined UADDR2
ID -
Buffer Closed on Reception of IDLES
The buffer was closed due to the reception of the programmable number
of consecutive IDLE sequences (defined in MAX-IDL).
Bits 7-5, 2 - Reserved for future use.
FR -
Framing Error
A character with a framing error was received and is located in the last
byte of this buffer. A framing error is detected by the UART controller when
no stop bit is detected in the receive data string.
PR - Parity Error
A character with a parity error was received and is located in the last byte
of this 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
Data length contains the number of octets written by the CP into this BD's
data buffer.
NOTE
The actual amount of memory allocated for this buffer should be
greater than or equal to the contents of maximum receive buffer
length register (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.
MOTOROLA
MC68302 USER'S MANUAL
4-47
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