CD2231 Intel Corporation, CD2231 Datasheet - Page 103
CD2231
Manufacturer Part Number
CD2231
Description
CD2231 Intelligent Two-channel Lan And Wan Communications Controller
Manufacturer
Intel Corporation
Datasheet
1.CD2231.pdf
(178 pages)
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8.2.9.3
8.2.9.4
Datasheet
Register Name: SCHR3
Register Description: Special Character Register 3
Default Value: x’00
Access: Byte Read/Write
Register Name: SCHR4
Register Description: Special Character Register 4
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 7
Note: Special characters 3 and 4 are not stripped from the data stream if Flow Control Transparency
SCHR1 = XON
SCHR2 = XOFF
In addition to the SCDE and TxIBE bits, if the FCT bit (COR3) is set when flow control characters
are received, they are stripped from the data stream.
MNP 4 Mode
SCHR1 holds the start character.
SCHR1 holds the escape character
Special Character Register 3 (SCHR3)
Special Character Register 4 (SCHR4)
Special characters 3 and 4 are used in conjunction with the ESCDE bit of COR3 to detect
characters in the receive data stream and to generate receive special character interrupts.
(FCT) mode is enabled.
SCHR1
SCHR2
Bit 6
Bit 6
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
MNP 4/ARAP 1.0
SYN 16 hex
DLE 10 hex
Bit 5
Bit 5
User-defined special character
User-defined special character
Bit 4
Bit 4
ARAP 2.0
SOH 01 hex
ESC 1B hex
Bit 3
Bit 3
Bit 2
Bit 2
Motorola Hex Address: x’1C
Motorola Hex Address: x’1D
Bit 1
Bit 1
Intel Hex Address: x’1F
Intel Hex Address: x’1E
Bit 0
Bit 0
103
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