Z51F0410 Datasheet, PDF (137/184 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F0410
Product Specification
PSR1[0]
R/W
Initial value : 00H
Analog Comparator Output Enable (Disable logic input gate)
0
disable
1
enable
4.10 Buzzer Driver
4.10.1 Overview
The Buzzer consists of 8 Bit Counter and BUZDR (Buzzer Data Register), BUZCR (Buzzer Control
Register). The Square Wave (61.035Hz~125 KHz, @8MHz) gets out of P12/BUZ pin. BUZDR (Buzzer
Data Register) controls the Buzzer frequency (look at the following expression). In the BUZCR
(Buzzer Control Register), BUCK[1:0] selects source clock divided from prescaler.
BUZDR[7:0]
0000_0000
0000_0001
…
1111_1101
1111_1110
1111_1111
f_BUZ (Hz)

2
Oscillator Frequency
Prescaler Ratio  (BUZDR
 1)
Buzzer Frequency (kHz)
BUZCR[2:1]=00
BUZCR[2:1]=01
BUZCR[2:1]=10
125kHz
62.5kHz
31.25kHz
62.5kHz
31.25kHz
15.625kHz
…
…
…
492.126Hz
246.063Hz
123.031Hz
490.196Hz
245.098Hz
122.549Hz
488.281Hz
244.141Hz
122.07Hz
Table 11-12 Buzzer Frequency at 8 Mhz
BUZCR[2:1]=11
15.625kHz
7.812kHz
…
61.515Hz
61.274Hz
61.035Hz
PS029502-0212
PRELIMINARY
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