ST7263 datasheet(24/109 Pages) STMICROELECTRONICS

部件名	ST7263

功能描述	LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C

PDF	109 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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24 / 109 page

ST7263

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POWER SAVING MODES (Cont’d)

4.2.3 WAIT mode

WAIT mode places the MCU in a low power con-

sumption mode by stopping the CPU.

This power saving mode is selected by calling the

“WFI” ST7 software instruction.

All peripherals remain active. During WAIT mode,

the I bit of the CC register is forced to 0, to enable

all interrupts. All other registers and memory re-

main unchanged. The MCU remains in WAIT

mode until an interrupt or Reset occurs, whereup-

on the Program Counter branches to the starting

address of the interrupt or Reset service routine.

The MCU will remain in WAIT mode until a Reset

or an Interrupt occurs, causing it to wake up.

Refer to Figure 17.

Figure 17. WAIT Mode Flow Chart

WFI INSTRUCTION

RESET

INTERRUPT

CPU CLOCK

OSCILLATOR

PERIPH. CLOCK

I-BIT

CLEARED

OFF

CPU CLOCK

OSCILLATOR

PERIPH. CLOCK

I-BIT

SET

FETCH RESET VECTOR

OR SERVICE INTERRUPT

4096 CPU CLOCK

CYCLES DELAY

IF RESET

Note: Before servicing an interrupt, the CC register is

pushed on the stack. The I-Bit is set during the inter-

rupt routine and cleared when the CC register is

popped.

ST7263 数据表(PDF) 24 Page - STMicroelectronics

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