ST7L19 datasheet(36/138 Pages) STMICROELECTRONICS

Part #	ST7L19

Description	8-bit MCU for automotive with single voltage Flash/ROM memory, data EEPROM, ADC, 5 timers, SPI

PDF	138 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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36 / 138 page

ST7L15, ST7L19

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POWER SAVING MODES (cont’d)

9.3 WAIT MODE

WAIT mode places the MCU into a low power con-

sumption mode by stopping the CPU.

This power saving mode is selected by calling the

‘WFI’ instruction.

All peripherals remain active. During WAIT mode,

the I bit of the CC register is cleared to enable all

interrupts. All other registers and memory remain

unchanged. The MCU remains in WAIT mode until

an interrupt or reset occurs, whereupon it wakes

up and the Program Counter branches to the start-

ing address of the interrupt or reset service rou-

tine.

Refer to Figure 21.

Figure 21. WAIT Mode Flowchart

Notes:

1. Before servicing an interrupt, the CC register is pushed

on the stack. The I bit of the CC register is set during the

interrupt routine and cleared when the CC register is

popped.

WFI INSTRUCTION

RESET

INTERRUPT

CPU

OSCILLATOR

PERIPHERALS

IBIT

OFF

FETCH RESET VECTOR

OR SERVICE INTERRUPT

CPU

OSCILLATOR

PERIPHERALS

IBIT

OFF

CPU

OSCILLATOR

PERIPHERALS

IBIT

X1)

CYCLE DELAY

256 OR 4096 CPU CLOCK

ST7L19 Datasheet(PDF) 36 Page - STMicroelectronics

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