FDC37B78X SMSC Corporation, FDC37B78X Datasheet - Page 158

• Manufacturer Part Number: FDC37B78X
• Description: Enhanced Super I/O Controller with ACPI Support/ Real Time Clock and Consumer IR
• Manufacturer: SMSC Corporation

3
4-6
7
Note 1: This bit is set by hardware and can only be cleared by software writing a one to this bit
position and by Vbat POR. Writing a 0 has no effect.
Note 2: In the present implementation of Button_In, pressing the button will always wake the machine
(i.e., activate nPowerOn).
Power Management 1 Enable Register 1 (PM1_EN 1)
Register Location: <PM1_BLK>+2 System I/O Space
Default Value: 00h on Vbat POR
Attribute: Read/Write (Note 0)
Size: 8-bits
Power Management 1 Enable Register 2 (PM1_EN 2)
Register Location: <PM1_BLK>+3 System I/O Space
Default Value: 00h on Vbat POR
Attribute: Read/Write (Note 0)
Size: 8-bits
0
1
2
3-7
0-7
BIT
BIT
BIT
PWRBTNOR_STS
Reserved
WAK_STS
Reserved
PWRBTN_E
N
Reserved
RTC_EN
Reserved
NAME
NAME
NAME
This bit is used to enable the assertion of the Button_In to generate an
SCI event. The PWRBTN_STS bit is set anytime the Button_In signal is
asserted. The enable bit does not have to be set to enable the setting of
the PWRBTN_STS bit by the assertion of the Button_In signal.
Reserved.
This bit is used to enable the setting of the RTC_STS bit to generate an
SCI. The RTC_STS bit is set anytime the RTC generates an alarm.
Reserved. These bits always return a value of zero.
Reserved. These bits always return a value of zero.
This bit is set when the power switch over-ride function is set: If
PWRBTNOR_EN is set, and if the Button_In signal is held
asserted for more than four seconds. Hardware is also required to
reset the PWRBTN_STS when issuing a power switch over-ride
function. (Note 1)
Reserved. These bits always return a value of zero.
This bit is set when the system is in the sleeping state and an
enabled wakeup event occurs. This bit is set on the high-to-low
transition of nPowerOn, if the WAK_CTRL bit in the sleep / wake
configuration register (0xF0 in Logical Device A) is cleared. If the
WAK_CTRL bit is set, then any enabled wakeup event will also set
the WAK_STS bit in addition to the high-to-low transition of
nPowerOn. It is cleared by writing a 1 to its bit location when
nPowerOn is active (low). Upon setting this bit, the system will
transition to the working state. (Note 1)
DESCRIPTION
158
DESCRIPTION
DESCRIPTION