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ST72324BK bảng dữ liệu(PDF) 48 Page - STMicroelectronics |
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ST72324BK bảng dữ liệu(HTML) 48 Page - STMicroelectronics |
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48 / 188 page ![]() Power saving modes ST72324B 48/188 Figure 24. Slow mode clock transitions 8.3 Wait mode Wait mode places the MCU in a low power consumption 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[1:0] bits of the CC register are forced to ‘10’, 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 Program 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 25. Figure 25. Wait mode flowchart 1. Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits of the CC register are set to the current software priority level of the interrupt routine and recovered when the CC register is popped. 00 01 SMS CP1:0 fCPU New Slow Normal Run mode frequency request request fOSC2 fOSC2/2 fOSC2/4 fOSC2 WFI instruction Reset Interrupt Y N N Y CPU Oscillator Peripherals I[1:0] bits on on 10 off Fetch reset vector or service interrupt CPU Oscillator Peripherals I[1:0] bits on off 10 on CPU Oscillator Peripherals I[1:0] bits on on XX(1) on 256 or 4096 CPU clock cycle delay |
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