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參數資料
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: 83/160頁
文件大小: 1012K
代理商: W83977TF
W83977TF
PRELIMINARY
Publication Release Date:March 1998
-73 -
Revision 0.62
7.2 Alternate I/O Functions
W83977TF
provides several alternate functions
which are scattered among the
GP I/O ports. Table
7.2.1
shows their assignments. Polarity bit can also be set to alter their polarity.
Table
7.2
.1
GP I/O PORT
ALTERNATE FUNCTION
GP10
Interrupt Steering
GP11
Interrupt Steering
GP12
Watch Dog Timer Output/IRRX input
GP13
Power LED output/IRTX output
GP14
General Purpose Address Decoder/Keyboard Inhibit(P17)
GP15
General Purpose Write Strobe/ 8042 P12
GP16
Watch Dog Timer Output
GP17
Power LED output
GP20
Keyboard Reset (8042 P20)
GP21
8042 P13
GP22
8042 P14
GP23
8042 P15
GP24
8042 P16
GP25
GATE A20 (8042 P21)
GP30
Interrupt Steering
GP31
Interrupt Steering
GP32
General Purpose Address Decoder
GP33
General Purpose Address Decoder
GP34
Watch Dog Timer Output
7.2.1 Interrupt Steering
GP10, GP11, GP30, and GP31
can be programmed to map their own interrupt channels. The
selection of IRQ channel can be done in
configuration
registers CR70 and CR72 of logical device 7
and logical device 9
. Each interrupt channel also has its own 1 ms debounce filter that is used to
reject any noise
whose width
is equal to or less than 1 ms.
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