参数资料
型号: SCD223110QCD
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 2 CHANNEL(S), 256K bps, SERIAL COMM CONTROLLER, PQFP100
封装: METRIC, QFP-100
文件页数: 40/178页
文件大小: 2247K
代理商: SCD223110QCD
CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
134
Datasheet
8.5.3.2
Transmit Interrupt Register (TIR)
Bit 7
Ten
Transmit enable is set by the CD2231 to initiate a transmit interrupt request
sequence. It is cleared during a valid transmit interrupt acknowledge cycle.
Bit 6
Tact
Transmit active is set automatically when Ten is set, and the Fair Share logic allows
the assertion of a transmit interrupt request. It is cleared when the host CPU writes
to the Transmit End of Interrupt register.
Bit 5
Teoi
Transmit end of interrupt is set automatically when the host CPU writes to the Trans-
mit End of Interrupt register while in a transmit interrupt routine.
Bit 4
Reserved – always returns ‘0’ when read.
Bits 3:2
Tvct [1:0]
Transmit Vector bits are set by the CD2231 to provide the lower two bits of the vec-
tor supplied to the host CPU during an interrupt acknowledge cycle. Transmit vector
is decoded as follows: Tvct [1] = 1, and Tvct [0] = 0.
Bit 1
Reserved – always returns ‘0’ when read.
Bit 0
Tcn [0]
Transmit channel number is set by the CD2231 to indicate the channel requiring
transmit interrupt service.
Register Name: TIR
Register Description: Transmit Interrupt
Default Value: None, value varies
Access: Byte Read only
Intel Hex Address: x’EE
Motorola Hex Address: x’EC
Bit 7Bit 6Bit 5Bit 4Bit 3
Bit 2Bit 1
Bit 0
Ten
Tact
Teoi
0
Tvct [1]
Tvct [0]
0
Tcn [0]
Ten
Tact
Teoi
Sequence of Events
00
0
Idle
1
0
Transmit interrupt requested, but not asserted
1
0
Transmit interrupt asserted
0
1
0
Transmit interrupt acknowledged
0
1
Transmit interrupt service routine completed
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