參數(shù)資料
型號(hào)： PCI-PIO
英文描述： KARTE E/A 48 KANAL PCI BUS
中文描述： KARTE E / A值48卡納爾PCI總線
文件頁(yè)數(shù)： 14/24頁(yè)
文件大?。?/td> 81K
代理商： PCI-PIO
Page 8
Programming Details
Chapter 3
Page 8
01270187.doc
Blue Chip Technology Ltd.
The i8255 / μPD71055 PIO and i8254 / μPD71054 Counter/timer ICs are
complex devices. For full details on how to program these devices, refer to the
manufacturer’s data sheets. Presented here is a brief summary of the main
features of each.
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
Mode 1 enables the transfer of data to or from a specified 8 bit port (A or B) in
conjunction with strobes or handshaking signals on port C. These handshaking
signals may be used to drive interrupt channels if required.
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