User Guide

FIRST INTERNATIONAL COMPUTER,
INC.
- -
44
7. PMU08
The Embedded controller PMU08 acts as a supplement for power management control. It supports a lot of
functions via SMBus interface.
7.1 The System EC RAM With PMU08
Embedded Controller Command Set
The EC I/F command set allows the OS to communicate with the PMU08.
For detail information refer to ACPI 1.0B specification.
EC I/F Command
Comm
and
Byte
Encodi
ng
By
te
Regis
ter
R
/
W
Description Interrupt
#1 EC_S
C
W
Command
byte Header
Interrupt
on IBF=0
#2 EC_
DAT
A
W
Address byte
to read
No
Interrupt
Read Embedded
Controller
(RD_EC)
0x80
#3 EC_
DAT
A
R Read data
to host
Interrupt
on OBF=1
#1 EC_S
C
W
Command
byte Header
Interrupt
on IBF=0
#2 EC_
DAT
A
W
Address byte
to write
Interrupt
on IBF=0
Write Embedded
Controller
(WR_EC)
0x81
#3 EC_
DAT
A
W
Data to
write
Interrupt
on IBF=0
Burst Enable
Embedded
Controller
0x82 #1 EC_S
C
W
Command
byte Header
No
Interrupt
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