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: 41/178页
文件大小: 2247K
代理商: SCD223110QCD
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
Datasheet
135
8.5.3.3
Transmit Interrupt Status Register (TISR)
When the host receives a transmit interrupt, the following status is provided in this register:
Bit 7
Berr – Bus error (written by the CD2231)
0 = no bus error
1 = bus error was detected on the last transfer
Bit 6
EOF – Transmit end of frame indication in the DMA mode
This interrupt occurs when the final data character of a transmit frame is transferred
to the transmit FIFO.
Bit 5
EOB – Transmit end of buffer indication in the DMA mode
Bit 4
Transmit underrun error (HDLC only), otherwise zero (Async, PPP, SLIP, and
MNP4).
Bit 3
BA/BB – Applicable buffer for the register interrupt
0 = Transmit Buffer A
1 = Transmit Buffer B
Bit 2
Reserved – always returns ‘0’ when read.
Bit 1
TxEmpty – Transmitter empty
All characters have been completely transmitted, and the serial output is idle.
Bit 0
TxDat – The number of characters in the FIFO is below the threshold.
8.5.3.4
Transmit FIFO Transfer Count (TFTC)
Bits 7:5
Reserved – always returns ‘0’ when read.
Bits 4:0
Transmit data count
If the Transmit channel is interrupt driven, a non-zero value is a request for data.
These bits give the number of spaces available in the transmit FIFO.
Register Name: TISR
Register Description: Transmit Interrupt Status
Default Value: x’00
Access: Byte Read only
Intel Hex Address: x’89
Motorola Hex Address: x’8A
Bit 7
Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0
Berr
EOF
EOB
UE
BA/BB
0
TxEmpty
TxDat
Register Name: TFTC
Register Description: Transmit FIFO Transfer Count
Default Value: x’00
Access: Byte Read only
Intel Hex Address: x’83
Motorola Hex Address: x’80
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
TxCt4
TxCt3
TxCt2
TxCt1
TxCt0
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