PQFP100 datasheet(132/429 Pages) STMICROELECTRONICS

부품명	PQFP100

상세설명	8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM, E3 TM(EMULATED EEPROM), CAN 2.0B AND J1850 BLPD

PDF	429 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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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

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

PQFP100 데이터시트(PDF) 132 Page - STMicroelectronics

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