MEC1322 datasheet(351/456 Pages) MICROCHIP

tên linh kiện	MEC1322

Giải thích chi tiết về linh kiện	Keyboard and Embedded Controller for Notebook PC

PDF	456 Pages

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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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