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: 20/178页
文件大小: 2247K
代理商: SCD223110QCD
CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
116
Datasheet
Bit 0
Xoff – Send XOFF
Causes the transmission of an XOFF (cntl-S or hex 13).
The command structure associated with the sndsp Control bit is:
NOTE: The user should not use the send XON/XOFF commands if automatic in-band flow control is enabled
(Asynchronous modes only) in COR5.
8.4.2.2
SLIP/MNP4 Mode
SLIP, MNP4, and Automatic In-Band Flow Control modes are only available on Revision B and
later devices.
Special characters can be transmitted preemptively (ahead of any characters in the transmit FIFO)
upon commands described below. When the special character is transmitted, the STCR is cleared
by the device.
Bit 7
Reserved – must be ‘0’.
Bit 6
Abort
Transmission of the two-character sequence (7D–7E) aborts the current transmit
frame. All data in the FIFO following the abort is discarded. If DMA is used, the
remaining data up to the EOF is discarded.
Bits 5:4
Reserved – must be ‘0’.
Bit 3
SndSpc – Send special character command
When clear, the frame, Xon, and Xoff bits described below have no meaning.
When set, the host should also set one of the following bits: frame, Xon, or Xoff.
Bit 2
Frame – Send framing error
Causes the next character in the transmit stream to be sent with an incorrect stop bit
(stop bit is ‘0’).
This bit is intended as a test function. Unlike the Abort bit, this bit does not terminate
the transmission.
Bits 1:0
Reserved – must be ‘0’.
sndsp
frame
Xon
Xoff
Action
0
X
Send Special Disabled
1
X
Send one character with FE
1
0
1
X
Send Xon
1
0
1
Send Ooff
Register Name: STCR
Register Description: Special Transmit Command
Default Value: x’00
Access: Byte Read/Write
Intel Hex Address: x’11
Motorola Hex Address: x’12
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
AbortTx
0
SndSpc
Frame
0
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