VT82C42 - ETC

VT82C42 VT82C42 Keyboard Controller

The internal timer counting is based on an 8Mhz clock input from X1, X2 ( or X2, with X1 connected to ground). After the deassertion of RESET#, the VT82C42 will drive high at pin P23 and pin P27. After 6 µs (6 x 8 clocks) of driving, the VT82C42 will check on pins T1 & P10; if both pins are low, then the VT82C42 will switch to PS/2 mode. Otherwise, the VT82.

Features

∗ ∗ ∗ ∗ ∗ Fully hardware implemented, 0.8µm CMOS Technology. Very high speed response of A20 GATE & reset. Support PS2 style mouse. Compatible with all major BIOS, including AWARD, PHOENIX and AMI. 40 pin PDIP and 44 pin PLCC packages. 3. Function Description: The internal timer counting is based on an 8Mhz clock input from X1, X2 ( or X2, with X1 connected to ground). After the deassertion of RESET#, the VT82C42 will drive high at pin P23 and pin P27. After 6 µs (6 x 8 clocks) of driving, the VT82C42 will check on pins T1 & P10; if both pins are low, then the VT82C42 will switch to PS/2 mo.