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ST90135 bảng dữ liệu(PDF) 73 Page - STMicroelectronics

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ST90135 bảng dữ liệu(HTML) 73 Page - STMicroelectronics

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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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