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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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STM8S Fiches technique(PDF) 115 Page - STMicroelectronics |
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STM8S Fiches technique(HTML) 115 Page - STMicroelectronics |
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115 / 467 page  DocID14587 Rev 14 115/467 RM0016 Auto-wakeup (AWU) 123 12.3 AWU functional description 12.3.1 AWU operation To use the AWU, perform the following steps in order: 1. Measure the LS clock frequency using the MSR bit in AWU_CSR register and TIM3 or TIM1 input capture 1. 2. Define the appropriate prescaler value by writing to the APR [5:0] bits in the Asynchronous prescaler register (AWU_APR). 3. Select the desired auto-wakeup delay by writing to the AWUTB[3:0] bits in the Timebase selection register (AWU_TBR). 4. Set the AWUEN bit in the Control/status register (AWU_CSR). 5. Execute the HALT instruction. AWU counters are reloaded and start to count a new AWU time interval. Note: The counters only start when the MCU enters Active-halt mode after a HALT instruction (refer to the Active-halt mode section in the power management chapter). The AWU interrupt is then enabled at the same time. The prescaler counter starts to count only if APR[5:0] value is different from its reset value, 0x3F. Idle mode If the AWU is not in use, then the AWUTB[3:0] bits the Timebase selection register (AWU_TBR) should be loaded with 0b0000 to reduce power consumption. |
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