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IT8712F

Environment Control – Low Pin Count Input / Outpu (EC - LPC I/O)

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Functional Description

9.10 Keyboard Controller (KBC)

The keyboard controller is implemented using an 8-bit microcontroller that is capable of executing the 8042

instruction set. For general information, please refer the description of the 8042 in the 8-bit controller

handbook. In addition, the microcontroller can enter power-down mode by executing two types of power-down

instructions. The 8-bit microcontroller has 256 bytes of RAM for data memory and 2 Kbytes of ROM for the

program storage.

The ROM codes may come from various vendors (or users), and are programmed during the manufacturing

process. To assist in developing ROM codes, the keyboard controller has an external access mode. In the

external access mode, the internal ROM is disabled and the instructions executed by the microcontroller come

from an externally connected ROM.

Keyboard P20

Controller P21

P26

T0

P27

P10

P23

T1

P22

P11

P24

P25

KRST*

GATEA20

KCLK

KDAT

MCLK

MDAT

KIRQ

MIRQ

Figure 9-10. Keyboard and Mouse Interface

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IT8712F V0.81

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