Overview Of Buzzer Output; Table 9.1-1 Output Frequency - Fujitsu F2MC-8L Series Hardware Manual

CHAPTER 9 BUZZER OUTPUT
9.1

Overview of Buzzer Output

The buzzer output can select from seven different output frequencies (square waves)
and can be used for applications such as sounding a buzzer to confirm key input. The
output pin also serves for remote-control transmission frequency output.
Buzzer Output Function
The buzzer output function outputs a signal (square wave) suitable for applications such as
sounding a buzzer to confirm an operation.
• The buzzer output function can select the buzzer output frequency from among seven
different frequencies or disable output.
• The timebase timer and watch prescaler supply four and three different frequency-divided
outputs as buzzer outputs, respectively.
Tip:
As the buzzer output uses a frequency-divided output of the timebase timer or watch
prescaler, clearing the clock supply source (timebase timer or watch prescaler) selected for
buzzer output affects the buzzer output function.
Check:
Since the timebase timer does not operate when the main clock stops oscillation (in subclock
mode), do not select any frequency-divided output of the main clock for buzzer output. If the
single-clock configuration has been selected by setting the option, do not select any
frequency-divided output of the watch prescaler.
Table 9.1-1 lists the seven output frequencies (square waves) that can be selected for the
buzzer output function.

Table 9.1-1 Output Frequency

Clock supply source
Timebase timer
Watch prescaler
F :
CH
F :
CL
220
Buzzer output cycle
12
2
11
2
10
2
2
2
2
2
Main-clock oscillation frequency
Subclock oscillation frequency The frequencies enclosed in ( ) assume F
4.2 MHz and F = 32.768 kHz.
CL
/F
CH
/F
CH
/F
CH
9
/F
CH
5
/F
CL
4
/F
CL
3
/F
CL
Square wave output (kHz)
12
F /2 (1.025 kHz)
CH
11
F /2 (2.051 kHz)
CH
10
F /2 (4.102 kHz)
CH
9
F /2 (8.203 kHz)
CH
5
F /2 (1.024 kHz)
CL
4
F /2 (2.048 kHz)
CL
3
F /2 (4.096 kHz)
CL
=
CH