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RM0312 Datasheet(PDF) 90 Page - STMicroelectronics |
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RM0312 Datasheet(HTML) 90 Page - STMicroelectronics |
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90 / 275 page  Beeper (BEEP) RM0312 90/275 DocID022352 Rev 3 13 Beeper (BEEP) 13.1 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 38 kHz. Figure 15. Beep block diagram 13.2 Beeper functional description 13.2.1 Beeper operation To use the beep function, perform the following steps in order: 1. Calibrate the LS clock frequency as described in Section 13.2.2: Beeper calibration to define BEEPDIV[4:0] value. 2. 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). 3. 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. BEEPEN BEEP pin LSI RC 38 kHz MSR to Timer Input Capture 5-BIT BEEPER PROG COUNTER ~8 kHz 3-BIT COUNTER 1 kHz, 2 kHz, 4 kHz (for measurement) fLS BEEPDIV[4:0] bits BEEPSEL[1:0] bits |
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