CD2481 Datasheet, PDF (138/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

CD2481 — Programmable Four-Channel Communications Controller
9.2.9.3
Special Character Register 3 (SCHR3)
Register Name: SCHR3
Register Description: Special Character Register 3
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
User defined special character,
protocol defined special character (see below).
9.2.9.4
Special Character Register 4 (SCHR4)
Intel Hex Address: x’1E
Motorola Hex Address: x’1D
Bit 1
Bit 0
Register Name: SCHR4
Register Description: Special Character Register 4
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
User defined special character,
protocol defined special character (see below).
Intel Hex Address: x’1F
Motorola Hex Address: x’1C
Bit 1
Bit 0
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.
NOTES:
1. Special characters 3 and 4 are not stripped from the data stream if Flow Control Transparency
(FCT) mode is enabled.
2. See “Programmable Sync Mode” on page 137 for information on SCHR usage in
Programmable Synch mode.
9.2.10
9.2.10.1
Special Character Range – Async Mode Only
Special Character Range low (SCRl)
Register Name: SCRL
Register Description: Special Character Range, low
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
User Defined Special Character Detect Range, low
Intel Hex Address: x’20
Motorola Hex Address: x’23
Bit 1
Bit 0
138
Datasheet