LM3S9B90 Datasheet, PDF (219/1185 Pages) Texas Instruments – Stellaris® LM3S9B90 Microcontroller

Stellaris® LM3S9B90 Microcontroller
Bit/Field
7
6
5
4
3
2
Name
VABORT
CLK32EN
LOWBATEN
PINWEN
RTCWEN
CLKSEL
Type
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
Description
Power Cut Abort Enable
Value
1
0
Description
Power cut is aborted.
A power cut occurs during a low-battery alert.
0
Clocking Enable
This bit must be enabled to use the Hibernation module.
Value
1
0
Description
The Hibernation module clock source is enabled.
The Hibernation module clock source is disabled.
The CLKSEL bit is used to select between the 4.194304-MHz crystal
source and the 32.768-kHz oscillator source. If a crystal is used, then
software should wait 20 ms after setting this bit to allow the crystal to
power up and stabilize.
0
Low Battery Monitoring Enable
Value
1
0
Description
Low battery voltage detection is enabled. If V_BAT <
V_LOWBAT, the LOWBAT bit in the HIBRIS register is set.
Low battery monitoring is disabled.
0
External WAKE Pin Enable
Value
1
0
Description
An assertion of the WAKE pin takes the microcontroller
out of hibernation.
The status of the WAKE pin has no effect on hibernation.
0
RTC Wake-up Enable
Value
1
0
Description
An RTC match event (the value the HIBRTCC register
matches the value of the HIBRTCM0 or HIBRTCM1
register) takes the microcontroller out of hibernation.
An RTC match event has no effect on hibernation.
0
Hibernation Module Clock Select
Value
1
0
Description
Use raw output. Use this value for a 32.768-kHz
oscillator.
Use Divide-by-128 output. Use this value for a
4.194304-MHz crystal.
June 14, 2010
219
Texas Instruments-Advance Information