LM3S1637 Datasheet, PDF (237/696 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Stellaris^® LM3S1637 Microcontroller
6.1
Block Diagram
Figure 6-1. Hibernation Module Block Diagram
XOSC0
XOSC1
HIBCTL.CLK32EN
32.768 kHz
4.194304 MHz _/128
HIBCTL.CLKSEL
Pre-Divider
HIBRTCT
Non-Volatile
Memory
64 words
HIBDATA
RTC
HIBRTCC
HIBRTCLD
HIBRTCM0
HIBRTCM1
WAKE
Interrupts
HIBIM
HIBRIS
HIBMIS
HIBIC
MATCH0/1
LOWBAT
V_DD
V_BAT
Low Battery
Detect
Power
Sequence
Logic
HIBCTL.LOWBATEN
HIBCTL.PWRCUT
HIBCTL.RTCWEN
HIBCTL.EXTWEN
HIBCTL.VABORT
Interrupts
to CPU
HIB
6.2 Signal Description
Table 6-1 on page 237 and Table 6-2 on page 238 list the external signals of the Hibernation module
and describe the function of each. These signals have dedicated functions and are not alternate
functions for any GPIO signals.
Table 6-1. Hibernate Signals (100LQFP)
Pin Name
Pin Number Pin Type Buffer Type^a Description
HIB
51
O
OD
An open-drain output with internal pull-up that indicates the
processor is in Hibernate mode.
VBAT
55
-
Power Power source for the Hibernation module. It is normally
connected to the positive terminal of a battery and serves as
the battery backup/Hibernation module power-source supply.
WAKE
50
I
TTL
An external input that brings the processor out of Hibernate
mode when asserted.
XOSC0
52
I
Analog Hibernation module oscillator crystal input or an external clock
reference input. Note that this is either a crystal or a
32.768-kHz oscillator for the Hibernation module RTC.
XOSC1
53
O
Analog Hibernation module oscillator crystal output. Leave
unconnected when using a single-ended clock source.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
June 18, 2012
237
Texas Instruments-Production Data