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ST92F124 Datasheet(PDF) 131 Page - STMicroelectronics

No. de pieza ST92F124
Descripción Electrónicos  8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM, E3 TMEMULATED EEPROM, CAN 2.0B AND J1850 BLPD
PDF  426 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92F124 Datasheet(HTML) 131 Page - STMicroelectronics

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ST92F124/F150/F250 - RESET AND CLOCK CONTROL UNIT (RCCU)
Figure 63. Example of Low Power mode programming in WFI using CK_AF external clock
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
** T2 = Quartz oscillator start-up time
* T1 = PLL lock-in time
T1*
T2**
FXtal = 4 MHz
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
DX[2:0]
← 000
MX[1:0]
← 00
Reset State
CK_AF selected and Xtal stopped
automatically
Begin
Execution of user program
resumes at full speed
9



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