ST90R158 datasheet(73/190 Pages) STMICROELECTRONICS

Part #	ST90R158

Description	8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM

PDF	190 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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73 / 190 page

73/190

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*

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

ST90R158 Datasheet(PDF) 73 Page - STMicroelectronics

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