W83977EF Winbond Electronics Corp America, W83977EF Datasheet - Page 86

• Manufacturer Part Number: W83977EF
• Description: Description = W83877TF Plus Kbc, GP I/O, Wake-Up, Power Fail Resume ;; Package = QFP 128
• Manufacturer: Winbond Electronics Corp America

7.2
W83977EF 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
GP10, and GP11can 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.
GP I/O PORT
7.2.1
GP10
GP11
GP12
GP13
GP14
GP15
GP16
GP17
GP20
GP21
GP22
GP23
GP24
GP25
Alternate I/O Functions
Interrupt Steering
Interrupt Steering
Interrupt Steering
Watch Dog Timer Output/IRRX input
Power LED output/IRTX output
General Purpose Address Decoder/Keyboard Inhibit(P17)
General Purpose Write Strobe/ 8042 P12
Watch Dog Timer Output
Power LED output
Keyboard Reset (8042 P20)
8042 P13
8042 P14
8042 P15
8042 P16
GATE A20 (8042 P21)
ALTERNATE FUNCTION
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Publication Release Date: April 2003
W83977EF
Revision 1.1