w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 124

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

12.3.2 Power Management 1 Status Register 2 (PM1STS2)
Register Location:
Default Value:
Attribute:
Size:
0
1-3
4
5
6-7
0-6
7
BIT
BIT
Reserved
WAK_STS
TMR_STS
Reserved
BM_STS
GBL_STS
Reserved
NAME
NAME
Reserved.
<CR60, 61> + 1H System I/O Space
00h
Read/write
8 bits
This bit is set when the system is in the sleeping state and an enabled
resume event occurs. Upon setting this bit, the sleeping/working state
machine will transition the system to the working state. This bit is only set by
hardware and is cleared by writing a 1 to this bit position, or by the
sleeping/working state machine automatically when the global standby timer
expires. Writing a 0 has no effect. When the WAK_STS is cleared and all
devices are in sleeping state, the whole chip enters the sleeping state.
Reserved.
Reserved. These bits always return zeros.
This bit is the timer carry status bit. This bit is set anytime the bit 23 of the
24-bit counter changes (whenever the MSB changes from low to high or
high to low). When TMR_EN and TMR_STS are set, a power management
event is raised. This bit is only set by hardware and can only be cleared by
writing a 1 to this bit position. Writing a 0 has no effect.
This is the bus master status bit. Writing a 1 to BM_CNTRL also sets
BM_STS. Writing a 1 clears this bit and also clears BM_CNTRL. Writing a
0 has no effect.
This is the global status bit. This bit is set when the BIOS wants the
attention of the SCI handler. BIOS sets this bit by setting BIOS_RLS and
can only be cleared by writing a 1 to this bit position. Writing a 1 to this bit
position also clears BIOS_RLS. Writing a 0 has no effect.
7
6
5
4
3
- 116 -
2
DESCRIPTION
DESCRIPTION
W83977ATF/W83977ATG
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
WAK_STS