CD2481
—
Programmable Four-Channel Communications Controller
130
Datasheet
COR3
–
Programmable Sync Mode
Bit 7:2
Reserved
–
must be zero.
Bits 3:0
Append1, Append0
–
Append characters
These bits define the number of characters to be appended to the buffer after receipt
of EOF character. The receiver re-enters SYN-hunt mode after the EOF and the pro-
grammed number of appended characters, if any, are received.
9.2.5
Channel Option Register 4 (COR4)
(Modem Change Options and FIFO Transfer Threshold)
Bit 7
DSRzd = 1
Detect one-to-zero transition on the DSR* input (zero-to-one transition of DSR
(MSVR) bit)
Bit 6
CDzd = 1
Detect one-to-zero transition on the CD* input (zero-to-one transition of CD
(MSVR) bit)
Bit 5
CTSzd = 1
Detect one-to-zero transition on the CTS* input (zero-to-one transition of CTS
(MSVR) bit)
Register Name: COR3
Register Description: Channel Option Register 3
Default Value: x
’
00
Access: Byte Read/Write
Intel Hex Address: x
’
15
Motorola Hex Address: x
’
16
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
0
Append1
Append0
Append1
Append0
Number of appended characters
0
0
EOF character not appended to frame data
0
1
EOF character is appended to frame data
0
1
Append EOF character and the first byte after EOF
1
1
Append EOF character and the first two bytes after EOF
Register Name: COR4
Register Description: Channel Option Register 4
Default Value: x
’
00
Access: Byte Read/Write
Intel Hex Address: x
’
16
Motorola Hex Address: x
’
15
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
DSRzd
CDzd
CTSzd
0
FIFO Threshold