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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
00
0
00
0
0
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
0018HBZ2 BZ1 BZ0 -----000 B
R/W R/W R/W
R/W
FCH
1
1
1
1
1
1
1
1
1
1
1
1
Address Initial value
Buzzer selection bits (FCH: 12.5 MHz)
Works as a general-purpose output port (P37)
or the 12-bit PPG output (PPG).
Outputs FCH/213 (1.526 kHz) to the BZ pin.
Outputs FCH/212 (3.052 kHz) to the BZ pin.
Outputs FCH/211 (6.104 kHz) to the BZ pin.
Outputs FCH/210 (12.21 kHz) to the BZ pin.
: Readable/Writable
: Initial value
: Unused
: Oscillation frequency