參數(shù)資料
型號: PCI-ADC
英文描述: MULTIFUNKTIONSKARTE 44 KANAL PCI BUS
中文描述: MULTIFUNKTIONSKARTE 44卡納爾PCI總線
文件頁數(shù): 24/35頁
文件大小: 124K
代理商: PCI-ADC
Page 16
Programming Details
Chapter 3
Page 16
01270193.doc
Blue Chip Technology Ltd.
i8255 / μPD71055 PIO
The PIO chip can operate in one of three modes.
The first (Mode 0) provides for simple inputs and outputs for three, 8-bit ports.
Data is written to or read from a specified port (A, B, or C) without the use of
handshaking. The following table gives a summary of the most commonly used
control words which must be written to the control port to configure the i8255 /
μPD71055 I/O ports in Mode 0.
CONTROL
WORD (hex)
CONTROL
WORD
(decimal)
128
129
130
131
136
137
138
139
144
145
146
147
152
153
154
155
SET ALL
of PORT
A as
Output
Output
Output
Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
SET ALL
of PORT
B as
Output
Output
Input
Input
Output
Output
Input
Input
Output
Output
Input
Input
Output
Output
Input
Input
SET HIGH
4 BITS of
C as
Output
Output
Output
Output
Input
Input
Input
Input
Output
Output
Output
Output
Input
Input
Input
Input
SET LOW
4 BITS of
C as
Output
Input
Output
Input
Output
Input
Output
Input
Output
Input
Output
Input
Output
Input
Output
Input
80
81
82
83
88
89
8A
8B
90
91
92
93
98
99
9A
9B
A typical sequence of events to use mode 0 would be :
Decide on the mix of input/outputs required and write the appropriate
code to the Control Register (see Address map).
Read from the selected input port or write to the selected output port.
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