Overview Of The Buzzer Output - Fujitsu F2MC-8L F202RA Hardware Manual

CHAPTER 15 BUZZER OUTPUT
15.1

Overview of the Buzzer Output

For the buzzer output, four kinds of output frequencies (square waves) can be selected.
The buzzer output may be used for the confirmation tone of key input and other tones.
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Buzzer Output Function
The buzzer output function is a function for outputting a signal (square wave) used for tones such as a
confirmation tone.
For the buzzer output, it is selectable whether to output one of four output frequencies or to disable the
output.
As the buzzer output, four kinds of divided-frequency outputs are supplied from the time-base timer.
Note:
The time-base timer supplies clock for the buzzer output. Therefore, buzzer output will be affected
when time-base timer is cleared.
Table 15.1-1 lists the four kinds of output frequencies (square waves) specifiable for the buzzer output.
Table 15.1-1 Output Frequencies
Clock supplier
time-base timer
F : Oscillation frequency
CH
Note:
Calculation example of an output frequency
If time-base timer output F
BZ0=0) and the oscillation (F
calculated as follows:
340
Buzzer output
13
2 /F
CH
12
2 /F
CH
11
2 /F
CH
10
2 /F
CH
10
/2 is selected in the buzzer register (BZCR) (BZ2=1, BZ1=0, and
CH
) is 12.5 MHz, the output frequency being output from the BZ pin is
CH
10
Output frequency = F /2
CH
= 12.5 MHz/1024
12.21 kHz
Square wave output (at 12.5 MHz)
13
F /2 (1.526 kHz)
CH
12
F /2 (3.052 kHz)
CH
11
F /2 (6.104 kHz)
CH
10
F /2 (12.21 kHz)
CH