MEC1322 Datasheet, PDF(155/456 Page) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

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MEC1322 Datasheet, PDF (155/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

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MEC1322

Offset 04h

Bits

Description

Type

1 IBF

R

Input Buffer Full. This bit is set to â1â whenever the Host writes data

or a command into the HOST_EC Data / CMD Registerr. When this

bit is set, the EC's 8042EM_IBF interrupt is asserted, if enabled.

When the EC reads the HOST_EC Data/CMD Register, this bit is

automatically reset and the interrupt is cleared.

Note:

This bit is not reset when PWRGD is asserted or when

the LPC interface powers down. To clear this bit, firm-

ware must read the EC Data Register in the EC-Only

address space.

0 OBF

R

Output Buffer Full. This bit is set when the EC writes a byte of Data

or AUX Data into the EC_HOST Data / AUX Data Register. When

the Host reads the HOST_EC Data / CMD Register, this bit is auto-

matically cleared by hardware and a 8042EM_OBF interrupt is gen-

erated.

Note:

This bit is not reset when PWRGD is asserted or when

the LPC interface powers down. To clear this bit, firm-

ware must read the HOST_EC Data / CMD Register in

the Runtime address space.

Default

0h

Reset

Event

VCC1_R

ESET

0h

VCC1_R

ESET

11.15 Emulated 8042 Interface EC-Only Registers

The registers listed in the EC-Only Register Summary table are for a single instance of the Emulated 8042 Interface.

The addresses of each register listed in this table are defined as a relative offset to the host âBase Addressâ defined in

the EC-Only Register Base Address Table.

TABLE 11-13: EC-ONLY REGISTER BASE ADDRESS TABLE

Block Instance

Instance Number

Host

Address Space

Base Address

Emulated 8042

0

Interface

EC

32-bit address

400F_0410h

space

The Base Address indicates where the first register can be accessed in a particular address space for a block instance.

TABLE 11-14: EC-ONLY REGISTER SUMMARY

Offset

Register Name (Mnemonic)

0h

HOST2EC Data Register

0h

EC Data Register

4h

EC Keyboard Status Register

8h

Keyboard Control Register

Ch

EC AUX Data Register

14h

PCOBF Register

ï£ 2014 - 2015 Microchip Technology Inc.

DS00001719D-page 155

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