
Serial Communication Controllers (SCCs)
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MC68360 USER’S MANUAL
CM—Continuous Mode
0 = Normal operation.
1 = The E-bit is not cleared by the CP after this BD is closed, allowing the associated
data buffer to be overwritten automatically when the CP next accesses this BD.
However, the E-bit will be cleared if an error occurs during reception, regardless of
the CM bit.
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).
AM—Address Match
This bit has meaning only if the address bit is set and the automatic multidrop mode was
selected in the UM bits. Following an address match, this bit defines which address char-
acter matched the user-defined address character, enabling the UART to receive data.
0 = The address matched the value in UADDR2.
1 = The address matched the value in UADDR1.
BR—Break Received
A break sequence was received while receiving data into this buffer.
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 a character without a stop bit. A new receive buffer will be used for fur-
ther data reception.
PR—Parity Error
A character with a parity error was received and is located in the last byte of this buffer. A
new receive buffer will be used for further data reception.
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 is the number of octets written by the CP into this BD’s data buffer. It is written
by the CP once as the BD is closed.
NOTE
The actual amount of memory allocated for this buffer should be
greater than or equal to the contents of the MRBLR.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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