CD2231 Intel Corporation, CD2231 Datasheet - Page 104

• Manufacturer Part Number: CD2231
• Description: CD2231 Intelligent Two-channel Lan And Wan Communications Controller
• Manufacturer: Intel Corporation

CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
8.2.10
8.2.10.1
8.2.10.2
8.2.11
104
Register Name: SCRL
Register Description: Special Character Range, low
Default Value: x’00
Access: Byte Read/Write
Register Name: SCRH
Register Description: Special Character Range, high
Default Value: x’00
Access: Byte Read/Write
Register Name: LNXT
Register Description: Literal Next Character
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 7
Bit 7
Special Character Range — Async Mode Only
Special Character Range low (SCRl)
Special Character Range high (SCRh)
These registers define an inclusive range for special character recognition in the Asynchronous
mode. It can be useful for identifying that a received character is within a user-defined range and is,
for example, a control character.
LNext Character (LNXT) — Async Mode Only
This register defines the LNext character. If the LNext function is enabled (COR7[6]), the CD2231
examines received characters and compare them against this value. If a match occurs, this character
and the following are placed in the FIFO without any special processing. In effect, the LNext
function causes the CD2231 to ignore characters with special meaning, such as flow control
characters. There are two exceptions: a ‘break’ or an ‘errored’ character. If the character following
the LNext character is either a ‘break’ or an ‘errored’ character, LNext is placed in the FIFO, and
the following character is treated as it normally would be for these error conditions.
Bit 6
Bit 6
Bit 6
Bit 5
Bit 5
Bit 5
User-defined special character detect range, high
User-defined special character detect range, low
User-defined literal next character
Bit 4
Bit 4
Bit 4
Bit 3
Bit 3
Bit 3
Bit 2
Bit 2
Bit 2
Motorola Hex Address: x’23
Motorola Hex Address: x’22
Motorola Hex Address: x’2E
Bit 1
Bit 1
Bit 1
Intel Hex Address: x’20
Intel Hex Address: x’21
Intel Hex Address: x’2D
Datasheet
Bit 0
Bit 0
Bit 0