W83L951DG Datasheet, PDF (25/112 Pages) Winbond – Mobile Keyboard and Embedded Controller

W83L951DG/W83L951FG
5.8 GPIO4 Part
General Purpose I/O Function
Change the value of GPIO 4 data register (GPIO4) and GPIO 4 direction register (GPIOD4) to
determine 8 input/output.
Universal Asynchronous Serial I/O Function
Change the value of chip control 1 register bit 3 (UART Function Enable) to enable Universal
Asynchronous Serial I/O Function.
Hardware Keyboard Reset Function
Change the value of keyboard control register bit4 (Port 92 Enable) and bit3 (Hardware Keyboard
Reset Control Enable) to enable Hardware Keyboard Reset Function.
Hardware Gate A20 Function
Change the value of keyboard control register bit4 (Port 92 Enable) and bit2 (Hardware Gate A20
Control Enable) to enable Hardware Gate A20 Function.
Table 5-9 GPIO4 pin configuration table
SYMBOL PIN I/O
FUNCTION
GP47
GP46
CLKRUN#
61 I/O_16tsh General Purpose I/O Function
General Purpose I/O Function
62 I/O_{16tsh Advance LPC function: It is used to request starting the clock}
GP45
General Purpose I/O Function
GATE_A20 ^{63 I/O16tsh} Gate A20 output
GP44
KBRST#
General Purpose I/O Function
64 I/O_{16tsh CPU reset output}
GP43
TXD
General Purpose I/O Function
65 I/O_{16tsh UART TX output}
GP42
RXD
General Purpose I/O Function
66 I/O_{16tsh UART RX Input}
GP41
67
FAN_TACH1
I/O_16tsh
General Purpose I/O Function
Fan tachometer 1
GP40
68
FAN_TACH0
I/O_16tsh
General Purpose I/O Function
Fan tachometer 0
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Publication Release Date: August 2006
Revision 1.0