VT8231 datasheet(93/132 Pages) ETC

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VT8231

Preliminary Revision 0.8 October 29, 1999

-87-

Function 4 Regs - Power Management, SMBus and HWM

7HFKQRORJLHV ,QF

:H &RQQHFW

Offset 53-50 - GP Timer Control (0000 0000h) ..............RW

31-30 Conserve Mode Timer Count Value

00 1/16 second ............................................default

01 1/8 second

10 1 second

11 1 minute

Conserve Mode Status

This bit reads 1 when in Conserve Mode

Conserve Mode Enable

Disable ...................................................default

1Enable

27-26 Secondary Event Timer Count Value

00 2 milliseconds.........................................default

01 64 milliseconds

10 ½ second

11 by EOI + 0.25 milliseconds

Secondary Event Occurred Status

This bit reads 1 to indicate that a secondary event has

occurred (to resume the system from suspend) and the

secondary event timer is counting down.

Secondary Event Timer Enable

Disable ...................................................default

1Enable

23-16 GP1 Timer Count Value (base defined by bits 5-4)

Write to load count value; Read to get current count

15-8 GP0 Timer Count Value (base defined by bits 1-0)

Write to load count value; Read to get current count

GP1 Timer Start

On setting this bit to 1, the GP1 timer loads the value

defined by bits 23-16 of this register and starts

counting down.

The GP1 timer is reloaded at the

occurrence of certain peripheral events enabled in the

Timer

Reload

Enable

(Power

Management I/O Space Offset 38h). If no such event

occurs and the GP1 timer counts down to zero, then

the GP1 Timer Timeout Status bit is set to one (bit-3

of the Global Status register at Power Management

GP1 Timer Timeout Enable bit is set (bit-3 of the

Global

Enable

Power

Management

generated.

GP1 Timer Automatic Reload

GP1 Timer stops at 0 .............................default

Reload GP1 timer automatically after counting

down to 0

5-4

GP1 Timer Base

00 Disable ...................................................default

01 1/4 msec

10 1 second

11 1 minute

GP0 Timer Start

On setting this bit to 1, the GP0 timer loads the value

defined by bits 15-8 of this register and starts

counting down.

The GP0 timer is reloaded at the

occurrence of certain peripheral events enabled in the

Timer

Reload

Enable

(Power

Management I/O Space Offset 38h). If no such event

occurs and the GP0 timer counts down to zero, then

the GP0 Timer Timeout Status bit is set to one (bit-2

of the Global Status register at Power Management

GP0 Timer Timeout Enable bit is set (bit-2 of the

Global

Enable

Power

Management

generated.

GP0 Timer Automatic Reload

GP0 Timer stops at 0 ............................ default

Reload GP0 timer automatically after counting

down to 0

1-0

GP0 Timer Base

00 Disable................................................... default

01 1/16 second

10 1 second

11 1 minute

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