ST72324BK2 datasheet(66/188 Pages) STMICROELECTRONICS

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On-chip peripherals

ST72324B

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10.2.5

Low power modes

10.2.6

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).

10.2.7

MCC registers

MCC control/status register (MCCSR)

)

Table 36.

Effect of low power modes on MCC/RTC

Mode

Description

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 37.

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.

MCCSR

Reset value: 0000 0000 (00h)

76543

210

MCO

CP[1:0]

SMS

TB[1:0]

OIE

OIF

R/W

Table 38.

MCCSR register description

Bit

Name

Function

7MCO

Main Clock Out selection

This bit enables the MCO alternate function on the PF0 I/O port. It is set and

cleared by software.

0: MCO alternate function disabled (I/O pin free for general-purpose I/O).

1: MCO alternate function enabled (fCPU on I/O port).

Note: To reduce power consumption, the MCO function is not active in Active Halt

mode.

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