CD2481 Datasheet, PDF (136/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

CD2481 — Programmable Four-Channel Communications Controller
Bits 1:0
Transmit processing for CR and NL; these bits define Translation mode when CR
and/or NL are present in the transmit data.
ONLCR
0
0
1
1
OCRNL
0
1
0
1
No special action
CR translated to NL
NL translated to the sequence CR NL
CR translated to NL and NL translated to
the sequence CR NL
COR7 —Programmable Sync Mode
Register Name: COR7
Register Description: Channel Option 7
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
SYN2 Character
Intel Hex Address: x’04
Motorola Hex Address: x’07
Bit 2
Bit 1
Bit 0
9.2.9
9.2.9.1
In Programmable Sync (CMR mode 0x08) mode, this register defines the SYN2 character, to be
used to find character synchronization within the receive data stream. Unused bits must be zero.
Special Character Registers –
Async and Programmable Sync Modes
Special Character registers can be used for detecting specific receive characters in the incoming
data stream, and can be used in Async Mode to transmit character(s) (by STCR) preempting any
data in the transmit FIFO.
Special Character Register 1 (SCHR1)
Register Name: SCHR1
Register Description: Special Character Register 2
Default Value: x’00
Access: R/W – Async
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
User defined special character,
protocol defined special characters (see below).
Intel Hex Address: x’1C
Motorola Hex Address: x’1F
Bit 1
Bit 0
136
Datasheet