W83977ATF Datasheet, PDF (10/207 Pages) Winbond – WINBOND I/O

W83977ATF
PRELIMINARY
1.2 General Purpose I/O Port
SYMBOL PIN
I/O
FUNCTION
GP20
(KBRST)
69
I/O_12t General purpose I/O port 2 bit 0.
Alternate Function from GP20: Keyboard reset. (KBC P20)
SMI
70
OD₁₂ System Management Interrupt. (CR2B bit 4_3 = 00, default)
In the legacy power management mode, SMI is driven low by
the power managenment events.
GP21
(P13)
I/O_12t
General purpose I/O port 2 bit 1. (CR2B bit 4_3 = 01)
Alternate Function from GP21: KBC P13 I/O port.
P16
I/O_12t KBC P16 I/O port. (CR2B bit 4_3 = 10)
PANSWOUT ⁷²
GP22
(P14)
OD₁₂
I/O_12t
Panel Switch output. (CR2B bit 5 = 0, default)
General purpose I/O port 2 bit 2. (CR2B bit 5 = 1)
Alternate Function from GP22: KBC P14 I/O port.
PANSWIN
GP23
73
IN_12t Panel Switch input. (CR2B bit 7_6 = 00, default)
I/O_12t General purpose I/O port 2 bit 3. (CR2B bit 7_6 = 01)
(P15)
Alternate Function from GP23: KBC P15 I/O port.
GP24
(P16)
40
I/O_12t General purpose I/O port 2 bit 4. (CR2A bit 5_4 = 01)
Alternate Function from GP24: KBC P16 I/O port.
P13
CIRRX
I/O_12t
IN_t
KBC P13 I/O port. (CR2A bit 5_4 = 10)
Consumer IR receiving input. (CR2A bit 5_4 = 00)
GP25
(GA20)
39
I/O₁₂ General purpose I/O port 2 bit 5. (CR2A bit 3_2 = 10)
Alternate Function from GP25: GATE A20. (KBC P21)
IRRXH
IRSL0
IN_t FIR receiving input. (CR2A bit 3_2 = 00)
OUT_12t IR module select 0. (CR2A bit 3_2 = 01)
Publication Release Date: April 1998
-9 -
Revision 0.52