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AN2857 Datasheet(PDF) 12 Page - STMicroelectronics

Part # AN2857
Description  STM8S and STM8A family power management
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2857 Datasheet(HTML) 12 Page - STMicroelectronics

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Run and low-power modes
AN2857
12/31
Doc ID 15241 Rev 3
4
Run and low-power modes
By default, after a reset, the microcontroller is in run mode. The default CPU clock is a 16
MHz HSI divided by eight due to the HSIDIV register reset value.
Several low-power modes are available to save power when it is not needed to keep the
CPU running, for example, when waiting for an external event. It is up to the user to select
the mode that gives the best compromise between low power consumption, short startup
time, good peripheral functionality, and availability of wakeup sources.
STM8S and STM8A devices feature three main low-power modes:
●
Wait mode (CPU stopped, peripherals kept running)
●
Active halt mode (CPU stopped, AWU (auto wakeup) and IWDG (independent
watchdog) kept running if activated).
●
Halt mode (everything is stopped)
Power consumption in run and wait mode can also be reduced by one of the following
means:
●
Slowing down the system clocks
●
Gating the clocks to the peripherals when they are not used
Table 3 summarizes the functioning modes of STM8S and STM8A devices. It gives an
overview of the mode combinations which can be used to fit an application’s requirements in
terms of consumption and wakeup time.
Note:
When the LPVR is used, the MVR is automatically switched off.
Table 3.
Functioning modes
Mode
Voltage
regulator
Flash Oscillators CPU Peripherals
Entry
Wake up
trigger event
Run
MVR
On
On
On
On
-
-
Wait
MVR
On
On
Off
On
Execute
WFI(1)
instruction
1.
WFI = Wait for interrupt
All internal or
external interrupts
and reset
Active halt
MVR
On
Off except
LSI or HSE
Off
AWU and
IWDG on
(if activated)
Enable the
AWU then
execute HALT
instruction
AWU or external
interrupts and
reset
Off
LPVR
On
Off except
LSI or HSE
Off
Halt
LPVR
On
Off
Off
Off
Execute HALT
instruction
External interrupts
and reset
Off



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