Fujitsu F2MC-8L F202RA Hardware Manual page 360

CHAPTER 15 BUZZER OUTPUT
Table 15.4-1 Functions of Each Bit in Buzzer Register (BZCR)
bit7
to
bit3
bit2
to
bit0
344
Bit name
Unused bits
BZ2, BZ1, and BZ0:
Buzzer selection bits
Function
• Undefined at read
• No effect on the operation at write
• Select a buzzer output and enable the output.
• If 000 is set to these bits, the buzzer output is
B
disabled and the pin works as a general-purpose port
(P37) or as the 12-bit PPG output (PPG). With the
exception of 000 , the pin becomes the buzzer pin
B
and outputs a square wave. Even if the pin has been
functioning as the 12-bit PPG output, setting a value
other than 000 causes the pin to work as the BZ pin
B
prior to its operation as the PPG pin.
For the buzzer output, four kinds of time-base timer
divided cycle outputs are supplied.