12 Buzzer driver
A buzzer of A96G166/A96A166/A96S166 consists of 8-bit counter, a buzzer data register (BUZDR),
and a buzzer control register (BUZCR). It outputs square wave (61.035Hz to 125.0kHz @ 8MHz)
through P11/AN8/EINT6/EC1/BUZO pin, and its buzzer data register (BUZDR) controls the buzzer
frequency (refer to the following expression). In a buzzer control register (BUZCR), BUCK[2:0] bits
select a source clock divided by prescaler.
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