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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST90135 Scheda tecnica(PDF) 73 Page - STMicroelectronics |
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ST90135 Scheda tecnica(HTML) 73 Page - STMicroelectronics |
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73 / 190 page  73/190 ST90158 - RESET AND CLOCK CONTROL UNIT (RCCU) Figure 35. 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 2MHz 12 MHz 2MHz 12 MHz *T1 = PLL lock-in time T1* T1* FXtal = 4 MHz, VDD = 2.7 V min 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 LPOWF I ← 1 WFI status Interrupt Routine CSU_CKSEL ← 1 DX2-0 ← 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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