MEC1322 Datasheet, PDF (351/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
30.0 KEYBOARD SCAN INTERFACE
30.1 Overview
The Keyboard Scan Interface block provides a register interface to the EC to directly scan an external keyboard matrix
of size up to 18x8.
The maximum configuration of the Keyboard Scan Interface is 18 outputs by 8 inputs. For a smaller matrix size, firmware
should configure unused KSO pins as GPIOs or another alternate function, and it should mask out unused KSIs and
associated interrupts.
30.2 References
No references have been cited for this feature.
30.3 Terminology
There is no terminology defined for this section.
30.4 Interface
This block is designed to be accessed externally via the pin interface and internally via a registered host interface.
FIGURE 30-1:
I/O DIAGRAM OF BLOCK
Host Interface
Keyboard Scan Interface
Power, Clocks and Reset
Signal Description
Interrupts
30.5 Signal Description
TABLE 30-1: SIGNAL DESCRIPTION TABLE
Name
Direction
Description
KSI[7:0]
KSO[17:0]
Input
Output
Column inputs from external keyboard matrix.
Row outputs to external keyboard matrix.
 2014 - 2015 Microchip Technology Inc.
DS00001719D-page 351