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RM0312 Datasheet(PDF) 84 Page - STMicroelectronics

Part # RM0312
Description  STM8TL5xxx microcontroller family
PDF  275 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RM0312 Datasheet(HTML) 84 Page - STMicroelectronics

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Auto-wakeup (AWU)
RM0312
84/275
DocID022352 Rev 3
12
Auto-wakeup (AWU)
12.1
Introduction
The AWU is used to provide an internal wakeup time base that is used when the MCU goes
into Active-halt power saving mode. This time base is clocked by the low speed internal
(LSI) RC oscillator clock.
12.2
LSI clock measurement
To ensure the best possible accuracy when using the LSI clock, its frequency can be
measured with TIM2 timer input capture 1.
Figure 14. AWU block diagram
COUNTER
AWU COUNTER
6-BIT PROG
AWUTB[3:0]
15 time bases
AWU Interrupt
AWUEN & HALT/WAIT
MSR
APR[5:0]
to Timer 2 input capture 1
(for measurement)
fLSI
fLS
LSI RC
38 kHz



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