Pin Of The Buzzer Output; P37/Bz/Ppg Pin - Fujitsu F2MC-8L F202RA Hardware Manual

CHAPTER 15 BUZZER OUTPUT
15.3

Pin of the Buzzer Output

The pin related to the buzzer output is P37/BZ/PPG.
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P37/BZ/PPG Pin

The P37/BZ/PPG pin works as a general-purpose I/O (P37) pin, output pin for the buzzer output (BZ), or
output pin for the 12-bit PPG (PPG).
● BZ pin
The BZ pin outputs the square wave for the buzzer of the frequency having been specified for the BZ pin.
When a buzzer output frequency is specified (other than BZCR:BZ2,BZ1,BZ0=000
automatically works as the BZ pin regardless of the value of output latch. Even if the PPG output has been
enabled, it works as the BZ pin that has higher priority.
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Block Diagram of the Pin Related to the Buzzer Output
Note:
If pull-up resistor supported is specified by the pull-up setting register, the state of the pin in stop mode
(SPL=1) is not Hi-Z but "H" level (pull-up state). During a reset, however, the pull-up is disabled and
the state is Hi-Z.
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Figure 15.3-1 Block Diagram of Pin Related to Buzzer Output
PDR
PDR read
PDR read
(At read-modify-write)
Output latch
PDR write
DDR
DDR write
PUL read
PUL
PUL write
Stop mode (SPL=1)
Peripheral output
Peripheral
output
enable
Stop mode
(SPL=1)
), the P37/BZ/PPG pin
B
Pull-up resistor
Pch
Pin
P37/BZ/PPG
Nch