ST72324BJ2 datasheet(65/188 Pages) STMICROELECTRONICS

부품명	ST72324BJ2

상세설명	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

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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ST72324B

On-chip peripherals

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10.2.2

Clock-out capability

The clock-out capability is an alternate function of an I/O port pin that outputs the fCPU clock

to drive external devices. It is controlled by the MCO bit in the MCCSR register.

Caution:

When selected, the clock out pin suspends the clock during Active Halt mode.

10.2.3

Real-time clock (RTC) timer

The counter of the real-time clock timer allows an interrupt to be generated based on an

accurate real-time clock. Four different time bases depending directly on fOSC2 are available.

The whole functionality is controlled by four bits of the MCCSR register: TB[1:0], OIE and

OIF.

When the RTC interrupt is enabled (OIE bit set), the ST7 enters Active Halt mode when the

HALT instruction is executed. See Section 8.4: Active Halt and Halt modes on page 49 for

more details.

10.2.4

Beeper

The beep function is controlled by the MCCBCR register. It can output three selectable

frequencies on the Beep pin (I/O port alternate function).

Figure 35.

Main clock controller (MCC/RTC) block diagram

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

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