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ST7LITEUS2 数据表(PDF) 55 Page - STMicroelectronics |
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ST7LITEUS2 数据表(HTML) 55 Page - STMicroelectronics |
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55 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) ST7LITEUS2, ST7LITEUS5 Power saving modes 55/136 After this startup delay, the CPU resumes operation by servicing the AWUFH interrupt. The AWU flag and its associated interrupt are cleared by software reading the AWUCSR register. To compensate for any frequency dispersion of the AWU RC oscillator, it can be calibrated by measuring the clock frequency fAWU_RC and then calculating the right prescaler value. Measurement mode is enabled by setting the AWUM bit in the AWUCSR register in Run mode. This connects fAWU_RC to the input capture of the 8-bit lite timer, allowing the fAWU_RC to be measured using the main oscillator clock as a reference timebase. Similarities with Halt mode The following AWUFH mode behavior is the same as normal Halt mode: ● The MCU can exit AWUFH mode by means of any interrupt with exit from Halt capability or a reset (see Section 8.4: Active-halt and Halt modes). ● When entering AWUFH mode, the I bit in the CC register is forced to 0 to enable interrupts. Therefore, if an interrupt is pending, the MCU wakes up immediately. ● In AWUFH mode, the main oscillator is turned off causing all internal processing to be stopped, including the operation of the on-chip peripherals. None of the peripherals are clocked except those which get their clock supply from another clock generator (such as an external or auxiliary oscillator like the AWU oscillator). ● The compatibility of watchdog operation with AWUFH mode is configured by the WDGHALT option bit in the option byte. Depending on this setting, the HALT instruction when executed while the watchdog system is enabled, can generate a watchdog reset. Figure 26. AWUF Halt timing diagram AWUFH interrupt fCPU RUN MODE HALT MODE 64 tCPU RUN MODE fAWU_RC Clear by software tAWU Obsolete Product(s) - Obsolete Product(s) |
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