CD2401 Intel, CD2401 Datasheet - Page 111

• Manufacturer Part Number: CD2401
• Description: Multi-protocol Communications Controller
• Manufacturer: Intel

8.2.10
8.2.10.1
8.2.10.2
8.2.11
Datasheet
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 Register — 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 Register (LNXT) — Async Mode only
This register defines the LNext character. If the LNext function is enabled (COR7[6]), the CD2401
examines received characters and compares them against this value. If a match occurs, this
character and the next are placed in the FIFO without any special processing. In effect, the LNext
function causes the CD2401 to ignore characters with special meaning, such as flow control
characters. There are two exceptions. If the character following the LNext character is either a
‘BREAK’ or an ‘ERROR’ character, LNext is placed in the FIFO, and the following next 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 Range Detect – high
User-Defined Special Character Range Detect – low
User-Defined Literal Next Character
Bit 4
Bit 4
Bit 4
Multi-Protocol Communications Controller — CD2401
Bit 3
Bit 3
Bit 3
Bit 2
Bit 2
Bit 2
Motorola Hex Address: x’2E
Motorola Hex Address: x’23
Motorola Hex Address: x’22
Bit 1
Bit 1
Bit 1
Intel Hex Address: x’2D
Intel Hex Address: x’20
Intel Hex Address: x’21
Bit 0
Bit 0
Bit 0
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