MEC1404 Datasheet, PDF (307/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
The sleep enable inputs have no effect on the Hibernation Timer and the clock required outputs are only asserted during
register read/write cycles for as long as necessary to propagate updates to the block core.
20.10 EC-Only Registers
The registers listed in the EC-Only Register Summary table are for a single instance of the Hibernation Timer. The
addresses of each register listed in this table are defined as a relative offset to the host “Base Address” defined in the
EC-Only Register Base Address Table.
TABLE 20-2: EC-ONLY REGISTER BASE ADDRESS TABLE
Block Instance
Hibernation Timer
Instance
Number
0
Host
EC
Address Space
32-bit internal
address space
Base Address
0000_9800h
The Base Address indicates where the first register can be accessed in a particular address space for a block instance.
TABLE 20-3: HIBERNATION TIMER SUMMARY
Offset
00h
04h
08h
Register Name
HTimer Preload Register
HTimer Control Register
HTimer Count Register
20.10.1 HTIMER PRELOAD REGISTER
Offset ^00h
Bits
Description
Type
15:0 HT_PRELOAD
R/W
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.
Default
000h
Reset
Event
nSYSR
ST
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