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ST92F120V9 Datasheet(PDF) 99 Page - STMicroelectronics |
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ST92F120V9 Datasheet(HTML) 99 Page - STMicroelectronics |
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99 / 324 page  99/324 ST92F120 - RESET AND CLOCK CONTROL UNIT (RCCU) Figure 46. Example of Low Power mode programming in WFI using CK_AF external clock n User’s Program WFI instruction PROGRAM FLOW INTCLK FREQUENCY Interrupt PLL multiply factor Divider factor set Wait for the PLL to lock CK_AF clock selected Wait For Interrupt No code is executed until Interrupt serviced set to 10 to 1, and PLL turned ON an interrupt is requested Low Power Mode enabled 2 MHz 20 MHz 2 MHz 20 MHz ** TSTUP = Quartz oscillator start-up time * TPLK = PLL lock-in time TPLK* FXtal = 4 MHz, VDD = 4.5 V min WAIT CSU_CKSEL ← 1 PLL is system clock source while CK_AF is the System Clock and the Xtal restarts FCK_AF The System Clock switches to Xtal in WFI state in WFI state User’s Program Preselect Xtal stopped when CK_AF selected activated Wait for the Xtal WAIT PLL is System Clock source to stabilise Wait for the PLL to lock WAIT WFI_CKSEL ← 1 XTSTOP ← 1 LPOWFI ← 1 WFI status Interrupt Routine XTSTOP ← 0 CKAF_SEL ← 0 CSU_CKSEL ← 1 DX2-0 ← 000 MX(1:0) ← 00 Reset State CK_AF selected and Xtal stopped automatically Begin Execution of user program resumes at full speed TSTUP** 9 |
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