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ST6215C Datasheet(PDF) 34 Page - STMicroelectronics

Part No. ST6215C
Description  8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST6215C Datasheet(HTML) 34 Page - STMicroelectronics

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7.2 WAIT MODE
The MCU goes into WAIT mode as soon as the
WAIT instruction is executed. This has the follow-
ing effects:
– Program execution is stopped, the microcontrol-
ler software can be considered as being in a “fro-
zen” state.
– RAM contents and peripheral registers are pre-
served as long as the power supply voltage is
higher than the RAM retention voltage.
– The oscillator is kept running to provide a clock
to the peripherals; they are still active.
WAIT mode can be used when the user wants to
reduce the MCU power consumption during idle
periods, while not losing track of time or the ability
to monitor external events. WAIT mode places the
MCU in a low power consumption mode by stop-
ping the CPU. The active oscillator (main oscillator
or LFAO) is kept running in order to provide a clock
signal to the peripherals.
If the power consumption has to be further re-
duced, the Low Frequency Auxiliary Oscillator
(LFAO) can be used in place of the main oscillator,
if its operating frequency is lower. If required, the
LFAO must be switched on before entering WAIT
mode.
Exit from Wait mode
The MCU remains in WAIT mode until one of the
following events occurs:
– RESET (Watchdog, LVD or RESET pin)
– A peripheral interrupt (timer, ADC,...),
– An external interrupt (I/O port, NMI)
The Program Counter then branches to the start-
ing address of the interrupt or RESET service rou-
tine. Refer to Figure 20.
See also Section 7.4.1.
Figure 20. WAIT Mode Flowchart
WAIT INSTRUCTION
RESET
INTERRUPT
Y
N
N
Y
Clock to CPU
OSCILLATOR
Clock to PERIPHERALS
On
Yes
No
FETCH RESET VECTOR
OR SERVICE INTERRUPT
2048
Clock to CPU
OSCILLATOR
Clock to PERIPHERALS
Restart
Yes
Yes
DELAY
CLOCK CYCLE
OSCILLATOR
Clock to PERIPHERALS
Clock to CPU
Yes
Yes
On
1


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