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參數(shù)資料
| 型號(hào)： | ST6225CM1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, OSCILLATOR SAFEGUARD, SAFE RESET AND 28 PINS |
| 中文描述： | 8位檢察官辦公室/存儲(chǔ)器與阿微控制器/ D轉(zhuǎn)換器，振蕩器保障，安全復(fù)位和28個(gè)引腳 |
| 文件頁數(shù)： | 31/70頁 |
| 文件大小： | 472K |
| 代理商： | ST6225CM1 |
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ST62T15C/T25C/E25C
POWER SAVING MODE
(Cont’d)
3.5.3 Exit from WAIT and STOP Modes
The following paragraphs describe how the MCU
exits from WAIT and STOP modes, when an inter-
rupt occurs (not a Reset). It should be noted that
the restart sequence depends on theoriginal state
of the MCU (normal, interrupt or non-maskable in-
terrupt mode) prior to entering WAIT or STOP
mode, as well as on the interrupt type.
Interrupts do not affect the oscillator selection,
consequently, when the LFAO is used, the user
program must manage oscillator selectionas soon
as normal RUN mode is resumed.
3.5.3.1 Normal Mode
If the MCUwas in themain routine when the WAIT
or STOP instruction was executed, exit from Stop
or Waitmode will occur as soon as an interrupt oc-
curs; the related interrupt routine is executed and,
on completion, the instruction which follows the
STOP or WAIT instruction is then executed, pro-
viding no other interrupts are pending.
3.5.3.2 Non Maskable Interrupt Mode
If the STOP or WAIT instruction has been execut-
ed during execution of the non-maskable interrupt
routine, theMCU exits from the Stop orWait mode
as soon as an interrupt occurs: the instruction
which follows the STOP or WAIT instruction is ex-
ecuted, and the MCU remains innon-maskable in-
terrupt mode, even if another interrupt has been
generated.
3.5.3.3 Normal Interrupt Mode
If theMCU was in interrupt mode before the STOP
or WAIT instruction was executed, it exits from
STOP or WAIT mode as soon as an interrupt oc-
curs. Nevertheless, two cases must be consid-
ered:
– 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 the interrupt mode. At the end of this rou-
tine pending interrupts will be serviced in accord-
ance with their priority.
– In the event of a non-maskable interrupt, the
non-maskable interrupt service routine is proc-
essed first,then the routine inwhich the WAIT or
STOP mode was entered will be completed by
executing the instruction following the STOP or
WAIT instruction. The MCU remains in normalin-
terrupt mode.
Notes:
To achieve the lowest power consumption during
RUN or WAIT modes, the user program must take
care of:
– configuringunused I/Osas inputs withoutpull-up
(these should be externally tied to well defined
logic levels);
– placing all peripherals in their power down
modes before entering STOP mode;
– selecting the Low Frequency Auxiliary Oscillator
(provided this runs at a lower frequency than the
main oscillator).
When the hardware activated Watchdog is select-
ed, or when the software Watchdog is enabled,the
STOP instruction is disabled and a WAIT instruc-
tion will be executed in its place.
If all interrupt sources are disabled (GEN low), the
MCU can only be restarted by a Reset. Although
setting GEN low does not mask the NMI as an in-
terrupt, it will stop it generating a wake-up signal.
The WAIT and STOP instructions are not execut-
ed if an enabled interrupt request is pending.
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