ST6201CM-Auto datasheet(35/96 Pages) STMICROELECTRONICS

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7.4 NOTES RELATED TO WAIT AND STOP MODES

7.4.1 Exit from Wait and Stop Modes

7.4.1.1 NMI Interrupt

It should be noted that when the GEN bit in the

IOR register is low (interrupts disabled), the NMI

interrupt is active but cannot cause a wake up from

STOP/WAIT modes.

7.4.1.2 Restart Sequence

When the MCU exits from WAIT or STOP mode, it

should be noted that the restart sequence de-

pends on the original state of the MCU (normal, in-

terrupt or non-maskable interrupt mode) prior to

entering WAIT or STOP mode, as well as on the

interrupt type.

Normal Mode. If the MCU was in the main routine

when the WAIT or STOP instruction was execut-

ed, exit from Stop or Wait mode will occur as soon

as an interrupt occurs; the related interrupt routine

is executed and, on completion, the instruction

which follows the STOP or WAIT instruction is

then executed, providing no other interrupts are

pending.

Non Maskable Interrupt Mode. If the STOP or

WAIT instruction has been executed during execu-

tion of the non-maskable interrupt routine, the

MCU exits from Stop or Wait mode as soon as an

interrupt occurs: the instruction which follows the

STOP or WAIT instruction is executed, and the

MCU remains in non-maskable interrupt mode,

even if another interrupt has been generated.

Normal Interrupt Mode. If the MCU was in inter-

rupt mode before the STOP or WAIT instruction

was executed, it exits from STOP or WAIT mode

as soon as an interrupt occurs. Nevertheless, two

cases must be considered:

– If the interrupt is a normal one, the interrupt rou-

tine in which the WAIT or STOP mode was en-

tered will be completed, starting with the

execution of the instruction which follows the

STOP or the WAIT instruction, and the MCU is

still in interrupt mode. At the end of this routine

pending interrupts will be serviced according to

their priority.

– In the event of a non-maskable interrupt, the

non-maskable interrupt service routine is proc-

essed first, then the routine in which the WAIT or

STOP mode was entered will be completed by

executing the instruction following the STOP or

WAIT instruction. The MCU remains in normal in-

terrupt mode.

7.4.2 Recommended MCU Configuration

For lowest power consumption during RUN or

WAIT modes, the user software must configure

the MCU as follows:

– Configure unused I/Os as output push-pull low

mode

– Place all peripherals in their power down modes

before entering STOP mode

– Select the Low Frequency Auxiliary Oscillator

(provided this runs at a lower frequency than the

main oscillator).

The WAIT and STOP instructions are not execut-

ed if an enabled interrupt request is pending.

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