Abov MC96F6332D, User Manual

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MC96F6432
June 22, 2018 Ver. 2.9 181
11.9 Buzzer Driver
11.9.1 Overview
The Buzzer consists of 8 bit counter, buzzer data register (BUZDR), and buzzer control register (BUZCR). The
Square Wave (61.035Hz~125.0 kHz @8MHz) is outputted through P13/SEG17/AN10/EC1/BUZO pin. The
buzzer data register (BUZDR) controls the buzzer frequency (look at the following expression). In buzzer control
register (BUZCR), BUCK[1:0] selects source clock divided by prescaler.
Table 11-15 Buzzer Frequency at 8 MHz
BUZDR[7:0]
Buzzer Frequency (kHz)
BUZCR[2:1]=00 BUZCR[2:1]=01 BUZCR[2:1]=10 BUZCR[2:1]=11
0000_0000 125kHz 62.5kHz 31.25kHz 15.625kHz
0000_0001 62.5kHz 31.25kHz 15.625kHz 7.812kHz
… … … … …
1111_1101 492.126Hz 246.063Hz 123.031Hz 61.515Hz
1111_1110 490.196Hz 245.098Hz 122.549Hz 61.274Hz
1111_1111 488.281Hz 244.141Hz 122.07Hz 61.035Hz
11.9.2 Block Diagram
Pre
scaler
fx MUX
Counter
fx/32
fx/64
fx/128
fx/256
2
BUCK[1:0]
8-bit Up-Counter
BUZDR
Comparator
F/F
Clear
BUZO
BUZEN
Figure 11.48 Buzzer Driver Block Diagram
1) (BUZDR Ratio Prescaler 2
Frequency Oscillator
(Hz) f
BUZ
  
