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参数资料
| 型号： | ST5451D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), SERIAL COMM CONTROLLER, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 33/34页 |
| 文件大小： | 269K |
| 代理商： | ST5451D |
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EOM2
End of Message 2 (monitor channel)
MON2 has received an end of mes-
sage.
XAB2
Monitor Transmit ABORT
The received byte has not been de-
tected in two successive frames.
MON2 has sent an ABORT (A bit) to
the remote transmitter.
RMR2
Receive Monitor Register 2 ready
A byte has been received in register
MONR2.
RAB2
Receive ABORT
MON2 received an ABORT from the re-
mote receiver.
XMR2
Transmit Monitor Register 2 ready
A byte can be stored in register
MONX2.
MASK0, MASK1, MASK2
After Reset FF; the three mask registers MASK0,
MASK1, MASK2 are associated respectively to
the three interrupt registers ISTA0, ISTA1,and
ISTA2.
Each interrupt source in ISTA registers can be se-
lectively masked by setting to ”1” the correspond-
ing bit in MASK1. Interrupt sources (masked or
not) are indicated when ISTA is read by the mi-
croprocessor. When an interrupt source is not
masked, INT goes low.
STAR
Status Register
After Reset 48H
XDOV XFW IDLE
RLA DCIO
0
XDOV
Transmit Data Overflow
More than 32 bytes have been written
into the XFIFO.
XFW
XFIFO Write enable
Data can be entered into the XFIFO.
IDLE
IDLE State
15 or more consecutive ones have
been detected on the input data line.
RLA
Receive Line Active
Frames or interframe flags are being
received
DCIO
D and C/I Channels are occupied
CMDR
Command Register
After Reset 00
XHF XME RMC RMD RHR XRES M2RES M1RES
XHF
HDLC frame transmission can start.
XME
Transmit Message End
The last part of the frame was entered
in XFIFO and can be sent.
RMC
Receive Message Complete
Reaction to RPF or RME interrupt. The
received frame (or one pool of data)
has been read and the corresponding
RFIFO is free.
RMD
Receive Message Delete
Reaction to RPF or RME interrupt. The
entire frame will be ignored. The part of
frame already stored is deleted.
RHR
Reset HDLC receiver
XRES
Reset HDLC transmitter
XFIFO is cleared and the transmitted
frame (if any) is aborted.
M2RES
Monitor 2 Reset
Reset MONITOR and C/I channels (TX
and RX).
M1RES
Monitor 1 Reset
Reset MONITOR and C/I channels (TX
and RX).
*
For the four first bits (XHF, XME, RMC,
RMD), the reset is done by the device;
the other bits level sensitive
MODE
HDLC Mode Register
After Reset 00
DMA
FL1
FL0
ITF
RAC
CAC
NHF
FLA
DMA
DMA Interface activation
FL1/0
Frame Length
Minimum frame length accepted
FL1
FL0
3 bytes
4 bytes
5 bytes
6 bytes
0
1
0
1
0
1
ITF
InterframeTime Fill
ITF= 1 : Flags are transmitted
ITF= 0 : IDLE is transmitted
RAC
RAC= 1 : Activate RX
RAC= 0 : deactivate RX
ST5451
8/34
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相关代理商/技术参数 |
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| ST5451L | 制造商:Valor 功能描述: |
| ST5451N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:ISDN， Other/Special/Miscellaneous |
| ST5452L | 制造商:Pulse 功能描述:- Bulk |
| ST5453L | 制造商:Pulse 功能描述:- Bulk |
| ST5454L | 制造商:Pulse 功能描述:- Bulk |
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