MEC1322 Datasheet, PDF (343/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
29.0 PS/2 INTERFACE
29.1 Introduction
There are four PS/2 Ports in the MEC1322 which are directly controlled by the EC. The hardware implementation elim-
inates the need to bit bang I/O ports to generate PS/2 traffic, however bit banging is available via the associated GPIO
pins.
29.2 References
No references have been cited for this feature.
29.3 Terminology
There is no terminology defined for this section.
29.4 Interface
This block is designed to be accessed externally via the pin interface and internally via a registered host interface.
FIGURE 29-1:
I/O DIAGRAM OF BLOCK
Host Interface
Power, Clocks and Reset
PS/2 Interface
Signal Description
Interrupts
29.5 Signal Description
TABLE 29-1: SIGNAL DESCRIPTION TABLE
Name
Direction
Description
PS2DAT
PS2CLK
INPUT/
OUTPUT
INPUT/
OUTPUT
Data from the PS/2 device
Clock from the PS/2 device
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DS00001719D-page 343