ST72321R7-Auto datasheet(83/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

Main clock controller with real-time clock and beeper (MCC/RTC)

Doc ID 13829 Rev 1

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Figure 34.

Main clock controller (MCC/RTC) block diagram

11.6

Low power modes

11.7

Interrupts

The MCC/RTC interrupt event generates an interrupt if the OIE bit of the MCCSR register is

set and the interrupt mask in the CC register is not active (RIM instruction).

DIV 2, 4, 8, 16

MCC/RTC INTERRUPT

SMS

CP1

CP0

TB1

TB0

OIE

OIF

CPU CLOCK

MCCSR

12-BIT MCC RTC

COUNTER

TO CPU AND

PERIPHERALS

fOSC2

fCPU

MCO

BC1

BC0

MCCBCR

BEEP

SELECTION

BEEP SIGNAL

WATCHDOG

TIMER

DIV 64

Table 38.

Effect of low power modes on MCC/RTC

Mode

Effect

Wait

No effect on MCC/RTC peripheral.

MCC/RTC interrupt causes the device to exit from Wait mode.

Active Halt

No effect on MCC/RTC counter (OIE bit is set), the registers are frozen.

MCC/RTC interrupt causes the device to exit from Active Halt mode.

Halt

MCC/RTC counter and registers are frozen.

MCC/RTC operation resumes when the MCU is woken up by an interrupt with

“exit from HALT” capability.

Table 39.

MCC/RTC interrupt control/wake-up capability

Interrupt event

Event flag

Enable

control bit

Exit from

Wait

Exit from

Halt

Time base overflow event

OIF

OIE

Yes

No(1)

The MCC/RTC interrupt wakes up the MCU from Active Halt mode, not from Halt mode.

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