LAPIS Semiconductor ML610421, User Manual, Page: 302 / 437

ML610Q421/ML610Q422/ML610421 User’s Manual
Chapter 23 Melody Driver
23 – 12
23.3.6 Operations of Buzzer Output
A buzzer sound is output in the following procedure.
(1) Select a buzzer mode by setting the BZMD bit of the melody 0 control register (MD0CON) to “1”.
(2) Select a buzzer output mode using the melody 0 tempo code register (MD0TMP).
(3) Select a duty of the High level width of the buzzer output waveform using the melody 0 tone length code register
(MD0LEN).
(4) Set the buzzer output frequency in the melody 0 scale code register (MD0TON).
(5) Set bit 2 (ENMLT) of the frequency control register 1(FCON1) to “1” to enable the 2
×
low-speed clock.
(6) When the M0RUN bit of the melody 0 control register (MD0CON) is set to “1”, the waveform equivalent to the
buzzer sound that is set from the MD0 pin is output.
Figure 23-4 shows the output waveform of each buzzer output mode.
Figure 23-4 Output Waveform of Each Buzzer Output Mode
MD0CON.M0RUN
T8HZ
Buzzer output waveform
MD0*
(1/4) Output waveform of intermittent sound 1
MD0CON.M0RUN
T8HZ
Buzzer output waveform
MD0*
(2/4) Output waveform of intermittent sound 2
MD0CON.M0RUN
T8HZ
Buzzer output waveform
MD0*
(3/4) Output waveform of single sound
T1HZ
MD0CON.M0RUN
Buzzer output waveform
MD0*
(4/4) Output waveform of continuous sound