參數(shù)資料
型號: NS32FX100VF
廠商: National Semiconductor Corporation
英文描述: System Controller
中文描述: 系統(tǒng)控制器
文件頁數(shù): 44/94頁
文件大?。?/td> 955K
代理商: NS32FX100VF
2.0 Architecture
(Continued)
PCDI:
Port C data in. Read only.
Holds the current value of the pins (latched once
each CTTL).
7
6
5
4
3
2
1
0
UREN
UTXD
MWSO
SBPYS/
PCLK/
SNH/
PIO1
PIO0
DMRQ2
DMRQ1
DMRQ0
PCDO:
Port C data out.
Each bit holds the value driven onto the corre-
sponding output pin when the respective MS bit, in
the PCMS, register is ‘‘0’’.
7
6
5
4
3
2
1
0
UREN
UTXD
MWSO
SBYPS/ PCLK/
DMRQ2 DMRQ1 DMRQ0
SNH/
PIO1
PIO0
PCMS:
Port C module select.
7
6
5
4
3
2
1
0
MS7
MS6
MS5
MS4
MS3
MS2
res
MS2–MS7: The module select bits for port C I/O
pins.
0 : Port is selected.
The value of the corresponding bit in the PCDO
register is driven on the respective pin, when
Port C is enabled through the PCEN register.
1 : Module is selected.
The value of the pin specified by the corre-
sponding bit in the PCDO register is driven to/
from the appropriate module: Printer, Scanner,
DMA.
Upon reset this register is cleared to ‘‘0’’.
When the Scanner, Printer or DMA module is activated
through the MCFG register, MS2, MS3 and MS4 must be set
to ‘‘1’’ as detailed in the following table.
Module
MCFG.EDMA0
MS2
Module
MCFG.EPBMS
MS3
Module
MCFG.ESCAN
MS4
DMA
0
1
DMA
0
1
DMA
0
1
Scanner
1
1
Printer
1
1
Scanner
1
1
Port
X
0
Port
X
0
Port
X
0
44
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