User Guide

8965 N/B Maintenance

1.2.9 Keyboard System: Winbond W83L950D

The Winbond Keyboard controller architecture consists of a Turbo 51 core controller surrounded by various registers,

nine general purpose I/O port, 2k+256 bytes of RAM, four timer/counters, dual serial ports, 40K MTP-ROM that is

divided into four banks, two SMBus interface for master and slave, support 4 PWM channels, 2 D-A and 8 A-D

converters.

 8051 uC based

 Keyboard Controller Embedded Controller

 Supply embedded programmable flash memory (internal ROM size: 40KB) and RAM size is 2 KB

 Support 4 Timer (8 bit) signal with 3 prescalers

 Support 2 PWM channels, 2 D-A and 8 A-D converters

 Reduce Firmware burden by Hardware PS/2 decoding

 Support 72 useful GPIOs totally

 Support Flash utility for on board re-flash

 Support ACPI

 Hardware fast Gate A20 with software programmable

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