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參數(shù)資料
型號: W83977TF
廠商: WINBOND ELECTRONICS CORP
英文描述: Multi-Function I/O Port Controller(用于個人計算機的多功能輸入/輸出口控制器)
中文描述: 多功能I / O端口控制器(用于個人計算機的多功能輸入/輸出口控制器)
文件頁數(shù): 81/160頁
文件大小: 1012K
代理商: W83977TF
W83977TF
PRELIMINARY
Publication Release Date:March 1998
-71 -
Revision 0.62
7.1 Basic I/O functions
The Basic I/O functions of
W83977TF
provide several I/O operations including driving a logic value to
output port, latching a logic value from input port, inverting the input/output logic value, and steering
Common Interrupt (only available in the second group of the GP I/O port). Common Interrupt is the
ORed function of all interrupt channels in the second group of the GP I/O ports, and it also connects
to a 1ms debounce filter which can reject a noise of 1 ms pulse width or less. There are
three
8-bit
registers (
GP1, GP2, and GP3
) which are directly connected to those GP I/O ports. Each GP I/O port
is represented as a bit in one of three 8-bit registers. Only 6 bits of GP2 are implemented. Table
7
.1.1 shows their combinations of Basic I/O functions, and Table
7
.1.2 shows the register bit
assignments of
GP1, GP2, and GP3.
Table 7.1.1
I/O BIT
0 = OUTPUT
1 = INPUT
ENABLE INT BIT
0 = DISABLE
1 = ENABLE
POLARITY BIT
0 = NON INVERT
1 = INVERT
BASIC I/O OPERATIONS
0
0
0
Basic non-inverting output
0
0
1
Basic inverting output
0
1
0
Non-inverted output bit value of GP2
drive to Common Interrupt
0
1
1
Inverted output bit value of GP2 drive
to Common Interrupt
1
0
0
Basic non-inverting input
1
0
1
Basic inverting input
1
1
0
Non-inverted input drive to Common
Interrupt
1
1
1
Inverted input drive to Common
Interrupt
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