W83877ATG Nuvoton Technology Corporation of America, W83877ATG Datasheet - Page 161

• Manufacturer Part Number: W83877ATG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83877ATG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

11.4.2 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
<CR33>+1H System I/O Space
00h
Read/write
8 bits
Reserved.
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 software writing a 1 to this bit position or by the
sleeping/working state machine automatically upon the expiry of the global
standby timer. Writing a 0 has no effect. Upon the WAK_STS beingcleared
and all devices being in sleeping state, the whole chip enters the sleeping
state.
This bit is the timer carry status bit. This bit gets set anytime the bit 23 of the
24-bit counter changes (whenever the MSB changes from low to high or
high to low). While TMR_EN and TMR_STS are set, a power magement
event is raised. This bit is only set by hardware and can only be cleared by
the software writing a 1 to this bit position. Writing a 0 has no effect.
Reserved.
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 want the attention
of the SCI handler. BIOS sets this bit by setting BIOS_RLS and can only be
cleared by software writing a 1 to this bit position. Writing a 1 to this bit
position also clears BIOS_RLS. Writing a 0 has no effect.
Reserved. These bits always return a value of zero.
7
6
5
4
3
- 154 -
2
DESCRIPTION
DESCRIPTION
W83877ATF/W83877ATG
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
WAK_STS