參數(shù)資料
型號: PIO-96
英文描述: 96 CHANNEL PROGRAMMABLE INPUT/
中文描述: 96通道可編程的輸入/
文件頁數(shù): 5/29頁
文件大小: 108K
代理商: PIO-96
Port Map
Page 7
Blue Chip Technology Ltd.
01271015.doc
Page 7
3.0
PORT MAP
The PIO-96 has four
PD71055 (8255) chips. Each chip has three 8 bit ports
(A, B & C) which can be programmed as inputs or outputs by writing a control
word to the control port. (See Table 2). All “A” ports and “B” ports much each
be all input or all output, i.e. they should not be programmed to mixed input
and output bits within an individual port. Port C may be split into two 4 bit
sections each of which may be input or output. The board occupies sixteen
read/write addresses (four for each
PD71055 chip) in the IBM-PC port map.
ADDRESS
PORT
Base + 0
Port A
Base + 1
Port B
Base + 2
Port C
Base + 3
Command Port 1
Base + 4
Port A’
Base + 5
Port B’
Base + 6
Port C’
Base + 7
Command Port 2
Base + 8
Port A’’
Base + 9
Port B’’
Base + 10
Port C’’
Base + 11
Command Port 3
Base + 12
Port A’’’
Base + 13
Port B’’’
Base + 14
Port C’’’
Base + 15
Command Port 4
Table 1 - Port Addresses
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