BIT
4-6
NAME
DESCRIPTION
(Note 1)
Reserved
WAK_STS
Reserved. These bits always return a value of zero.
7
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)
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
BIT
0-7
NAME
Reserved
DESCRIPTION
Reserved. These bits always return a value of zero.
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
BIT
NAME
DESCRIPTION
0
PWRBTN_EN 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.
1
2
Reserved
RTC_EN
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.
3-7
Reserved
Power Management 1 Control Register 1 (PM1_CNTRL 1)
Register Location: <PM1_BLK>+4 System I/O Space
Default Value:00h on Vbat POR
Attribute:Read/Write (Note 0)
Size:8-bits
BIT
NAME
DESCRIPTION
0
SCI_EN
When this bit is set, then the SCI enabled power management events will
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