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MEC1322 Datasheet(PDF) 351 Page - Microchip Technology

Part # MEC1322
Description  Keyboard and Embedded Controller for Notebook PC
PDF  456 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MEC1322 Datasheet(HTML) 351 Page - Microchip Technology

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 2014 - 2015 Microchip Technology Inc.
DS00001719D-page 351
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.
30.5
Signal Description
FIGURE 30-1:
I/O DIAGRAM OF BLOCK
TABLE 30-1:
SIGNAL DESCRIPTION TABLE
Name
Direction
Description
KSI[7:0]
Input
Column inputs from external keyboard matrix.
KSO[17:0]
Output
Row outputs to external keyboard matrix.
Signal Description
Keyboard Scan Interface
Interrupts
Power, Clocks and Reset
Host Interface



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