ST72324BK datasheet(51/188 Pages) STMICROELECTRONICS

Part #	ST72324BK

Description	8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI

PDF	188 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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51 / 188 page

ST72324B

Power saving modes

51/188

Figure 28.

HALT timing overview

Figure 29.

Halt mode flowchart

WDGHALT is an option bit. See Section 14.1 on page 172 for more details.

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

Only some specific interrupts can exit the MCU from Halt mode (such as external interrupt). Refer to

Table 24: Interrupt mapping 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.

Halt

Run

256 or 4096 CPU

cycle delay

Reset

interrupt

Halt

instruction

Fetch

vector

[MCCSR.OIE = 0]

Halt instruction

Reset

Interrupt(3)

CPU

Oscillator

Peripherals(2)

I[1:0] bits

off

Fetch reset vector

or service interrupt

CPU

Oscillator

Peripherals

I[1:0] bits

off

XX(4)

CPU

Oscillator

Peripherals

I[1:0] bits

XX(4)

256 or 4096 CPU clock

delay

Watchdog

Enable

Disable

WDGHALT(1)

Watchdog

reset

(MCCSR.OIE = 0)

cycle

ST72324BK Datasheet(PDF) 51 Page - STMicroelectronics

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