MEC1322 Datasheet, PDF (230/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
TABLE 18-5: EC-ONLY REGISTER BASE ADDRESS TABLE
Block Instance
Instance
Number
Host
Address Space
Base Address
Hibernation Timer
0
EC
32-bit internal
4000_9800h
address space
The Base Address indicates where the first register can be accessed in a particular address space for a block instance.
TABLE 18-6:
Offset
00h
04h
08h
HIBERNATION TIMER SUMMARY
Register Name
HTimer Preload Register
HTimer Control Register
HTimer Count Register
18.10.1 HTIMER PRELOAD REGISTER
Offset ^00h
Bits
Description
15:0 HT_PRELOAD
This register is used to set the Hibernation Timer Preload value.
Writing this register to a non-zero value resets the down counter to
start counting down from this programmed value. Writing this regis-
ter to 0000h disables the hibernation counter. The resolution of this
timer is determined by the CTRL bit in the HTimer Control Register.
Writes to the HTimer Control Register are completed with an EC bus
cycle.
Type
R/W
Default
000h
Reset
Event
VCC1_R
ESET
18.10.2 HTIMER CONTROL REGISTER
Offset ^04h
Bits
Description
Type
15:1 Reserved
R
0 CTRL
R
1= The Hibernation Timer has a resolution of 0.125s per LSB, which
yields a maximum time in excess of 2 hours.
0= The Hibernation Timer has a resolution of 30.5µs per LSB, which
yields a maximum time of ~2seconds.
18.10.3 HTIMER COUNT REGISTER
Offset ^08h
Bits
Description
15:0 COUNT
The current state of the Hibernation Timer.
Type
R
Default
-
0000h
Reset
Event
-
VCC1_R
ESET
Default
0000h
Reset
Event
VCC1_R
ESET
DS00001719D-page 230
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