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HD4046212RFS Datasheet(PDF) 36 Page - Renesas Technology Corp |
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HD4046212RFS Datasheet(HTML) 36 Page - Renesas Technology Corp |
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36 / 157 page  HD404629R Series 34 Standby Mode: In standby mode, the oscillators continue to operate, but the clocks related to instruction execution stop. Therefore, the CPU operation stops, but all RAM and register contents are retained, and the D or R port status, when set to output, is maintained. Peripheral functions such as interrupts, timers, and serial interface continue to operate. The power dissipation in this mode is lower than in active mode because the CPU stops. The MCU enters standby mode when the SBY instruction is executed in active mode. Standby mode is terminated by a RESET input or an interrupt request. If it is terminated by RESET input, the MCU is reset as well. After an interrupt request, the MCU enters active mode and executes the next instruction after the SBY instruction. If the interrupt enable flag is 1, the interrupt is then processed; if it is 0, the interrupt request is left pending and normal instruction execution continues. A flowchart of operation in standby mode is shown in figure 15. Standby mode No Yes No Yes No Yes*1 No Yes No Yes*1 No Yes*1 Yes*1 Watch mode System clock oscillator started System clock oscillator started System reset Interrupts enabled No Yes IF = 1, IM = 0, IE = 1? RESET = 1? IF0 • IM0 = 1? IF1 • IM1 = 1? IFTA • IMTA = 1? IFTB • IMTB + IF2 • IM2 = 1? IFTC • IMTC + IF3 • IM3 = 1? IFTD • IMTD + IF4 • IM4 = 1? No Yes*1 IFAD • IMAD + IFS • IMS = 1? No Stop mode RESET = 1? STOPC = 0? RAME = 1 RAME = 0 Yes Yes No No Next instruction execution Next instruction execution Note: 1. Only when clearing from standby mode Figure 15 MCU Operation Flowchart |
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