ST72321BXXX-AUTO datasheet(90/247 Pages) STMICROELECTRONICS

Part #	ST72321BXXX-AUTO

Description	8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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

ST72321Bxxx-Auto

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11.8.2

MCC beep control register (MCCBCR)

The beep output signal is available in Active Halt mode but has to be disabled to reduce

consumption.

0OIF

Oscillator interrupt flag

This bit is set by hardware and cleared by software reading the MCCSR register. It

indicates when set that the main oscillator has reached the selected elapsed time

(TB1:0).

0: Timeout not reached

1: Timeout reached

Caution: The BRES and BSET instructions must not be used on the MCCSR

register to avoid unintentionally clearing the OIF bit.

Table 40.

Time base selection

Counter prescaler

Time base

TB1

TB0

fOSC2 =4MHz

fOSC2 =8MHz

16000

4ms

2ms

0

32000

8ms

4ms

0

1

80000

20ms

10ms

1

0

200000

50ms

25ms

1

Table 39.

MCCSR register description (continued)

Bit

Name

Function

MCCBCR

Reset value: 0000 0000 (00h)

7

654

32

10

Reserved

BC[1:0]

-RW

Table 41.

MCCBCR register description

Bit

Name

Function

7:2

-

Reserved, must be kept cleared.

1:0

BC[1:0]

Beep control

These 2 bits select the PF1 pin beep capability (see Table 42).

Table 42.

Beep frequency selection

BC1

BC0

Beep mode with fOSC2 =8MHz

00

Off

0

1

~2 kHz

Output

Beep signal

~50% duty cycle

1

0

~1 kHz

11

~500 Hz

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