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ST72334J Datasheet(PDF) 36 Page - STMicroelectronics |
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ST72334J Datasheet(HTML) 36 Page - STMicroelectronics |
36 / 153 page ST72334J/N, ST72314J/N, ST72124J 36/153 POWER SAVING MODES (Cont’d) 11.3 WAIT MODE WAIT mode places the MCU in a low power con- sumption mode by stopping the CPU. This power saving mode is selected by calling the ‘WFI’ instruction. All peripherals remain active. During WAIT mode, the I bit of the CC register is cleared, to enable all interrupts. All other registers and memory remain unchanged. The MCU remains in WAIT mode until an interrupt or RESET occurs, whereupon the Pro- gram Counter branches to the starting address of the interrupt or Reset service routine. The MCU will remain in WAIT mode until a Reset or an Interrupt occurs, causing it to wake up. Refer to Figure 21. Figure 21. WAIT Mode Flow-chart Note: 1. Before servicing an interrupt, the CC register is pushed on the stack. The I bit of the CC register is set during the interrupt routine and cleared when the CC register is popped. WFI INSTRUCTION RESET INTERRUPT Y N N Y CPU OSCILLATOR PERIPHERALS I BIT ON ON 0 OFF FETCH RESET VECTOR OR SERVICE INTERRUPT CPU OSCILLATOR PERIPHERALS I BIT ON OFF 0 ON CPU OSCILLATOR PERIPHERALS I BIT ON ON X 1) ON 4096 CPU CLOCK CYCLE DELAY |
Similar Part No. - ST72334J_03 |
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Similar Description - ST72334J_03 |
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