ST7FOXU0 datasheet(55/123 Pages) STMICROELECTRONICS

55 / 123 page

ST7FOXU0

Power saving modes

55/123

Figure 26.

AWUFH mode flowchart

WDGHALT is an option bit. See option byte section for more details.

Peripheral clocked with an external clock source can still be active.

Only an AWUFH interrupt and some specific interrupts can exit the MCU from Halt mode (such as external

interrupt). Refer to Table : for more details.

Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits of the CC register are

set to the current software priority level of the interrupt routine and recovered when the CC register is

popped.

RESET

INTERRUPT 3)

CPU

MAIN OSC

PERIPHERALS 2)

I[1:0] BITS

OFF

FETCH RESET VECTOR

OR SERVICE INTERRUPT

CPU

MAIN OSC

PERIPHERALS

I[1:0] BITS

OFF

XX 4)

CPU

MAIN OSC

PERIPHERALS

I[1:0] BITS

XX 4)

256 CPU CLOCK

DELAY

WATCHDOG

ENABLE

DISABLE

WDGHALT 1)

WATCHDOG

RESET

CYCLE

AWU RC OSC

OFF

AWU RC OSC

OFF

HALT INSTRUCTION

(Active-Halt disabled)

(AWUCSR.AWUEN=1)

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