Buzzer Volume - Texas Instruments OMAP5910 Technical Reference Manual

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Table of Contents

Pulse-Width Tone

Table 7–48. Buzzer Frequencies (Continued)

FRC Bits 5 - 2 1 - 0

The PWT was originally designed for a 13-MHz input clock, but the OMAP5910 device implements PWT with a 12-MHz

clock. Consequently, frequencies shown are not exact tones.

Buzzer Volume

Table 7–49. Buzzer Volume

Buzzer Frequency

The buzzer volume can be programmed (see Table 7–49) with bits 6 to 1 in the

volume control register VRC. The higher the 6 bit value is, the louder is the

buzzer/loudspeaker. To perform this programming, a 6-bit binary counter is

clocked with the PWT clock and rolls over to 0h after reaching its terminal value

(3 Fh). The counter value is compared with the 6-bit value programmed in

VRC. If the count value is less than or equal to VRC, the output has the value

Y = VOL value: 0 =<y<64

PWT_CLK = 12 MHz

Output signal H period = (y+1).PWT_CLK

Output signal L period = (63-y).PWT_CLK

VRC Bits 6 - 1 ; 0

FRC Bits 5 - 2 1 - 0

Buzzer/Loudspeaker

Buzzer Frequency