VT82C596 datasheet(70/96 Pages) ETC

70 / 96 page

VT82C596B

Revision 0.3 June 17, 1999

-64-

Function 3 Registers - Power Management and SMBus

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Offset 5B-58 – GP2/3 Timer Control (0000 0000h) ........RW

31-24 Reserved

........................................ always reads 0

23-16 GP3 Timer Count Value (base defined by bits 5-4)

Write to load count value; Read to get current count

15-8 GP2 Timer Count Value (base defined by bits 1-0)

Write to load count value; Read to get current count

GP3 Timer Start

On setting this bit to 1, the GP3 timer loads the value

defined by bits 23-16 of this register and starts

counting down.

The GP3 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 GP3 timer counts down to zero, then

the GP3 Timer Timeout Status bit is set to one (bit-13

of the Global Status register at Power Management

GP3 Timer Timeout Enable bit is set (bit-13 of the

Global

Enable

Power

Management

generated.

GP3 Timer Automatic Reload

This bit is set to one to enable the GP3 timer to reload

automatically after counting down to 0.

5-4

GP3 Timer Base

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

01 1/4 msec

10 1 second

11 1 minute

GP2 Timer Start

On setting this bit to 1, the GP2 timer loads the value

defined by bits 15-8 of this register and starts

counting down.

The GP2 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 GP2 timer counts down to zero, then

the GP2 Timer Timeout Status bit is set to one (bit-12

of the Global Status register at Power Management

GP2 Timer Timeout Enable bit is set (bit-12 of the

Global

Enable

Power

Management

generated.

GP2 Timer Automatic Reload

This bit is set to one to enable the GP2 timer to reload

automatically after counting down to 0.

1-0

GP2 Timer Base

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

01 1/16 second

10 1 second

11 1 minute

Offset 61 - Programming Interface Read Value ............ WO

7-0

Rx09 Read Value

The value returned by the register at offset 9h (Programming

Interface) may be changed by writing the desired value to this

location.

Offset 62 - Sub Class Read Value .................................... WO

7-0

Rx0A Read Value

The value returned by the register at offset 0Ah (Sub Class

Code) may be changed by writing the desired value to this

location.

Offset 63 - Base Class Read Value................................... WO

7-0

Rx0B Read Value

The value returned by the register at offset 0Bh (Base Class

Code) may be changed by writing the desired value to this

location.

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