
12-10
ML63326 User's Manual
Chapter 12 Melody Driver (MELODY63K)
12.5 Buzzer Circuit Operation
When EMBD (bit 2 of MDCON) is set to "1", a buzzer driver signal is sent to the melody driver
output pins (MD, MDB) or DACOUT and AOUT pins.
Four buzzer output modes can be selected by MBM1 (bit 1 of MDCON) and MBM0 (bit 0 of
MDCON): two types of intermittent tones, a single tone, or a continuous tone output. The
buzzer output frequency is 4 kHz and has a 50% duty ratio.
In the intermittent tone 1 mode, a waveform synchronized to the 8 Hz output of the time base
counter is output.
In the intermittent tone 2 mode, a waveform synchronized to the logical AND of 8 Hz signal
output and a "L" level of 1 Hz signal of the time base counter is output.
In the single tone mode, output starts in synchronization with the rising edge of EMBD. At the
second falling edge of the 32 Hz output of the time base counter, EMBD is cleared to "0" and
output is stopped.
In the continuous tone mode, output is continued while EMBD is "1".
While the melody is being output (MSF (bit 3 of MDCON) = "1"), the buzzer output is turned
OFF. If melody output is started during buzzer output, EMBD is cleared to "0", the buzzer
output is stopped, and melody output is given priority.
Figure 12-5 shows the output waveforms of each mode. Shaded sections indicate the 4 kHz
output frequency.
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