CD2231

Manufacturer Part NumberCD2231
DescriptionCD2231 Intelligent Two-channel Lan And Wan Communications Controller
ManufacturerIntel Corporation
CD2231 datasheet
 


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Page 104/178

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CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
8.2.10
Special Character Range — Async Mode Only
8.2.10.1
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
8.2.10.2
Special Character Range high (SCRh)
Register Name: SCRH
Register Description: Special Character Range, high
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
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.
8.2.11
LNext Character (LNXT) — Async Mode Only
Register Name: LNXT
Register Description: Literal Next Character
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
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.
104
Bit 4
Bit 3
User-defined special character detect range, low
Bit 4
Bit 3
User-defined special character detect range, high
Bit 4
Bit 3
User-defined literal next character
Intel Hex Address: x’20
Motorola Hex Address: x’23
Bit 2
Bit 1
Bit 0
Intel Hex Address: x’21
Motorola Hex Address: x’22
Bit 2
Bit 1
Bit 0
Intel Hex Address: x’2D
Motorola Hex Address: x’2E
Bit 2
Bit 1
Bit 0
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