RM0016 datasheet(121/467 Pages) STMICROELECTRONICS

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RM0016

Beeper (BEEP)

123

Beeper (BEEP)

13.1

Beeper introduction

This function generates a beep signal in the range of 1, 2 or 4 kHz when the LS clock is

operating at a frequency of 128 kHz.

Figure 26. Beep block diagram

13.2

Beeper functional description

13.2.1

Beeper operation

To use the beep function, perform the following steps in order:

Calibrate the LS clock frequency as described in Section 13.2.2: Beeper calibration to

define BEEPDIV[4:0] value.

Select 1 kHz, 2 kHz or 4 kHz output frequency by writing to the BEEPSEL[1:0] bits in

the Beeper control/status register (BEEP_CSR).

Set the BEEPEN bit in the Beeper control/status register (BEEP_CSR) to enable the

LS clock source.

Note:

The prescaler counter starts to count only if BEEPDIV[4:0] value is different from its reset

value, 0x1F.

MSv45270V1

HSE clock (4 – 24 MHz)

PRSC [1:0]

OPTION bits

CKAWUSEL

OPTION bit

~ 128 kHz LS clock

MSR

To timer input capture

(for measurement)

fLS

BEEPDIV[4:0] bits

BEEPEN

Prescaler

LSI RC

128 kHz

5-BIT BEEPER PROG

COUNTER

BEEPSEL[1:0] bits

3-BIT COUNTER

1 kHz, 2 kHz, 4 kHz

BEEP pin

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