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ST62E25BD3 Datasheet(PDF) 37 Page - STMicroelectronics |
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ST62E25BD3 Datasheet(HTML) 37 Page - STMicroelectronics |
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37 / 105 page  ST6215C ST6225C 37/105 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. 1 |
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