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: 37/178页
文件大小: 2247K
代理商: SCD223110QCD
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
Datasheet
131
8.5.2.5
Receive FIFO Output Count (RFOC)
Bits 7:5
Reserved – always returns ‘0’ when read.
Bits 4:0
Receive data count
If the receive channel is interrupt driven, a non-zero value in this bit field is the num-
ber of data characters available for transfer within the current receive interrupt.
8.5.2.6
Receive Data Register (RDR)
This Virtual register accesses the receive data FIFO of a channel interrupting for receive data
transfer. This register address is used for all channels to transfer receive FIFO data to the host, if
programmed in Interrupt Transfer mode. Data must be read as bytes, and follows the rules listed in
Section 8.3 for the positioning of valid data on the bus. If the BYTESWAP pin is high, data is valid
on A/D[7:0], if BYTESWAP is low, data is valid on A/D[15:8]. This is true because the RDR is on
an even address.
8.5.2.7
Receive End of Interrupt Register (REOIR)
REOIR — Asynchronous and HDLC Modes
The CD2231 interprets values written to this register at the completion of all receive interrupts.
Bit 7
Terminate current DMA buffer
If this bit is set, the current receive buffer is terminated and data transfer is switched
Register Name: RFOC
Register Description: Receive FIFO Output Count
Default Value: x’00
Access: Byte Read only
Intel Hex Address: x’33
Motorola Hex Address: x’30
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
RxCt4
RxCt3
RxCt2
RxCt1
RxCt0
Register Name: RDR
Register Description: Receive Data
Default Value: x’00
Access: Byte Read only
Intel Hex Address: x’F8
Motorola Hex Address: x’F8
Bit 7
Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0
D7
D6
D5
D4
D3
D2
D1
D0
Register Name: REOIR
Register Description: Receive End of Interrupt
Default Value: x’00
Access: Byte Write Only
Intel Hex Address: x’87
Motorola Hex Address: x’84
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
TermBuff
DiscExc
SetTm2
SetTm1
NoTrans
Gap2
Gap1
Gap0
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