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CHAPTER 15 BUZZER OUTPUT
15.4 Buzzer Register (BZCR)
The buzzer register (BZCR) is used to select an output frequency of the buzzer and also
serves as the buzzer output enable.
■ Buzzer Register (BZCR)
Figure 15.4-1 Buzzer Register (BZCR)
BZ2 BZ1 BZ0
000
00
0
0
0
0
0
0
0
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
0018
H
BZ2 BZ1 BZ0 ----- 000
B
R/W R/W R/W
R/W
F
CH
1
1
1
1
1
1
1
1
1
1
1
1
Address Initial value
Buzzer selection bits (F
CH
: 12.5 MHz)
Works as a general-purpose output port (P37)
or the 12-bit PPG output (PPG).
Outputs F
CH
/2
13
(1.526 kHz) to the BZ pin.
Outputs F
CH
/2
12
(3.052 kHz) to the BZ pin.
Outputs F
CH
/2
11
(6.104 kHz) to the BZ pin.
Outputs F
CH
/2
10
(12.21 kHz) to the BZ pin.
: Readable/Writable
: Initial value
: Unused
: Oscillation frequency