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H8/3003 数据表(PDF) 535 Page - Renesas Technology Corp |
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H8/3003 数据表(HTML) 535 Page - Renesas Technology Corp |
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535 / 715 page ![]() 17.4.4 Sample Application of Software Standby Mode Figure 17-1 shows an example in which software standby mode is entered at the fall of NMI and exited at the rise of NMI. With the NMI edge select bit (NMIEG) cleared to 0 in SYSCR (selecting the falling edge), an NMI interrupt occurs. Next the NMIEG bit is set to 1 (selecting the rising edge) and the SSBY bit is set to 1; then the SLEEP instruction is executed to enter software standby mode. Software standby mode is exited at the next rising edge of the NMI signal . Figure 17-1 NMI Timing for Software Standby Mode (Example) 17.4.5 Note The I/O ports retain their existing states in software standby mode. If a port is in the high output state, its output current is not reduced. ø NMI NMIEG SSBY NMI interrupt handler NMIEG = 1 SSBY = 1 Software standby mode (power- down state) Oscillator settling time (tosc2) SLEEP instruction NMI exception handling Clock oscillator 517 |
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