ST92250CV2QB View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST92250CV2QB
STMicroelectronics
ST92250CV2QB Datasheet PDF : 429 Pages
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ST92F124/F150/F250 - RESET AND CLOCK CONTROL UNIT (RCCU)
Figure 64. Example of Low Power mode programming in WFI using CLOCK2/16
PROGRAM FLOW
Begin
Reset State
INTCLK FREQUENCY
FXtal = 4 MHz
MX[1:0] ← 01
DX[2:0] ← 000
WAIT
CSU_CKSEL ← 1
PLL multiply factor
set to 6
Divider factor set
to 1, and PLL turned ON
Wait for the PLL to lock
T1*
PLL is system clock source
LPOWFI ← 1
User’s Program
WFI instruction
Low Power Mode enabled
in WFI state
Wait For Interrupt
activated
CLOCK2/16 selected and PLL
stopped automatically
2 MHz
12 MHz
Interrupt
WFI status
Interrupt Routine
No code is executed until
an interrupt is requested
Interrupt serviced
PLL switched on
CLOCK2 selected
125 KHz
WAIT
CSU_CKSEL ← 1
Wait for the PLL to lock
T1*
PLL is system clock source
User’s Program
Execution of user program
resumes at full speed
2 MHz
12 MHz
* T1 = PLL lock-in time
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