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ST92F124 Datasheet(PDF) 133 Page - STMicroelectronics |
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ST92F124 Datasheet(HTML) 133 Page - STMicroelectronics |
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133 / 429 page  133/429 ST92F124/F150/F250 - RESET AND CLOCK CONTROL UNIT (RCCU) Figure 64. Example of Low Power mode programming in WFI using CLOCK2/16 User’s Program WFI instruction PROGRAM FLOW INTCLK FREQUENCY Interrupt PLL multiply factor Divider factor set Wait for the PLL to lock Wait For Interrupt No code is executed until Interrupt serviced set to 6 to 1, and PLL turned ON an interrupt is requested Low Power Mode enabled 2 MHz 12 MHz 2 MHz 12 MHz * T1 = PLL lock-in time T1* T1* FXtal = 4 MHz WAIT CSU_CKSEL ← 1 PLL is system clock source PLL switched on 125 KHz in WFI state User’s Program activated PLL is system clock source Wait for the PLL to lock WAIT LPOWFI ← 1 WFI status Interrupt Routine CSU_CKSEL ← 1 DX[2:0] ← 000 MX[1:0] ← 01 Reset State CLOCK2/16 selected and PLL automatically Begin CLOCK2 selected stopped Execution of user program resumes at full speed 9 |
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