Configuration Of The Buzzer Output - Fujitsu F2MC-8L F202RA Hardware Manual

15.2

Configuration of the Buzzer Output

The buzzer output consists of the following two blocks:
• Buzzer output selector
• Buzzer register (BZCR)
■
Block Diagram of the Buzzer Output
BZCR
From time-base timer
F
: Oscillation frequency
CH
● Buzzer output selector
The buzzer output selector is a circuit for selecting one of the four frequencies (square waves) output from
the time-base timer. The buzzer register (BZCR) sets it.
● Buzzer register (BZCR)
The buzzer register (BZCR) is a register for setting the buzzer output frequency and enable the buzzer
output. When the BZCR register sets an output frequency (other than 000
that the P37/BZ/PPG pin automatically becomes the buzzer output (BZ) pin. Even if the PPG pin has been
enabled, the BZ pin has higher priority.
Figure 15.2-1 Block Diagram of Buzzer Output
Internal data bus
BZ2
2 13 /F
CH
2 12 /F Buzzer output
CH
selector
2 11 /F
CH
2 10 /F
CH
CHAPTER 15 BUZZER OUTPUT
BZ1 BZ0
Selector
output
), the buzzer output is enabled so
B
Buzzer enable signal
Pin
P37/BZ/PPG
341