Buzzer Frequencies - Texas Instruments OMAP5910 Technical Reference Manual

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Table 7–48. Buzzer Frequencies

FRC Bits 5 - 2 1 - 0

The clock behind the multiplexer is divided by 154 to get the required frequen-

cies on the TONE output. The 12 frequencies in an octave can be programmed

with bits 5 to 2 of the frequency control register (FRC), and the octave can be

programmed with bits 1 to 0 of the FRC. Forty-eight different frequencies can

be programmed subdivided into four octaves with twelve frequencies. The four

frequency dividers with the complex coefficients

work with the fade out principle. To get the divider

6 pulses every 107 pulses are fade out. Over a long time the resulting frequen-

. The resulting signal has two different periods, which differ by one

period of the original signal. Because of this difference, the resulting signal has

jitter. To minimize this jitter, the divider works with high frequencies resulting

in short periods producing low jitter (see Table 7–48).

Buzzer Frequency

FRC Bits 5 - 2 1 - 0

MPU Public Peripherals

Pulse-Width Tone

from a periodic pulse,

Buzzer Frequency