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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92141 датащи(PDF) 68 Page - STMicroelectronics |
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ST92141 датащи(HTML) 68 Page - STMicroelectronics |
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68 / 179 page  68/179 ST92141 - RESET AND CLOCK CONTROL UNIT (RCCU) Figure 30. Example of Low Power Mode programming Begin WFI_CKSEL ← 1 WFI status User’s Program LPOWFI ← 1 User’s Program WFI End PROGRAM FLOW COMMENTS SYSTEM CLOCK FREQUENCY Interrupt Quartz divided by 2 PLL multiply factor Multiplier divider’s factor set Wait for the CK_AF clock selected when WFI Wait For Interrupt No code is executed until Interrupt served fixed to 10. to 1, and PLL turned ON an interrupt is requested Low Power Mode enabled Main code execution continued 2.5 MHz 25 MHz 2.5 MHz 25 MHz ** T2 = Quartz oscillator start-up time * T1 = PLL lock-in time T1* T2** T1* FQ=5 MHz, Vcc=5 V and T=25°C CK_AF/16 WAIT DX2-0 ← 000 Xtal is selected to restart the PLL quickly CSU_CKSEL 1 PLL is system clock source CSU_CKSEL<- 1 while the CK_AF is the system clock CKAF_SEL <- 0 The system CK switches to Xtal The PLL is locked and becomes the system clock XTSTOP ← 0 To restart Xtal and PLL To stop PLL and Xtal when a WFI occurs XTSTOP ← 1 PLL locking SET UP AFTER RESET PHASE: DIV2 = 1 XTSTOP = 0 MX(1:0) = 00 CSU_CKSEL = 0 Interrupt WAIT Routine (LOCK->1) CK_AF 1 |
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