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: 33/178页
文件大小: 2247K
代理商: SCD223110QCD
CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
128
Datasheet
RISRl — Asynchronous Mode
If RxData in IER is set, these interrupts are enabled.
Bit 7
Timeout – indicates that the receive FIFO is empty, and no data has been received
within the receive timeout period. There is no data character associated with this sta-
tus, and no other status bits are valid if the Time-Out bit is set.
Bits 6:4
Special character detect
Bit 3
Overrun error – indicates that new data has arrived, but the CD2231 FIFO or holding
registers are full. The new data is lost and the overrun indication is flagged on the
last character received before the overrun occurred.
Bit 2
Parity error – indicates that a parity error has occurred.
Bit 1
Framing error – indicates that a bad Stop bit is detected.
Bit 0
Break – indicates that a break is detected.
RISRl — Async-HDLC / PPP / MNP4 Mode
If RxData in IER is set, these interrupts are enabled.
Bit 7
Reserved – always returns ‘0’ when read.
Register Name: RISRl
Register Description: Receive Interrupt Status — Low
Default Value: x’00
Access: Byte Read only
Intel Hex Address: x’8A
Motorola Hex Address: x’89
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Timeout
SCdet2
SCdet1
SCdet0
OE
PE
FE
Break
SCdet[2:0]
Status
000
None detected
001
Special Character 1 matched
010
Special Character 2 matched
011
Special Character 3 matched (only if ESCDE is enabled in COR3)
100
Special Character 4 matched (only if ESCDE is enabled in COR3)
111
Character is within the inclusive range of the characters in the Special
Character Range low and high registers (only if RngDE is enabled in
COR3). Special character match can be enabled for error characters by
COR7.
Register Name: RISRl
Register Description: Receive Interrupt Status — Low
Default Value: x’00
Access: Byte Read only
Intel Hex Address: x’8A
Motorola Hex Address: x’89
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
EOF
RxAbt
CRC
OE
FE
0
Break
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