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CHAPTER 15 BUZZER OUTPUT
Table 15.4-1 Functions of Each Bit in Buzzer Register (BZCR)
Bit name Function
bit7
to
bit3
Unused bits
• Undefined at read
• No effect on the operation at write
bit2
to
bit0
BZ2, BZ1, and BZ0:
Buzzer selection bits
• Select a buzzer output and enable the output.
• If 000
B
is set to these bits, the buzzer output is
disabled and the pin works as a general-purpose port
(P37) or as the 12-bit PPG output (PPG). With the
exception of 000
B
, the pin becomes the buzzer pin
and outputs a square wave. Even if the pin has been
functioning as the 12-bit PPG output, setting a value
other than 000
B
causes the pin to work as the BZ pin
prior to its operation as the PPG pin.
For the buzzer output, four kinds of time-base timer
divided cycle outputs are supplied.