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TMP91C824
91C824-209
3.14 Melody / Alarm generator (MLD)
TMP91C824 incorporates melody function and alarm function, both of which are output from the
MLDALM pin. 5 kinds of fixed cycle interrupts are generated by the 15-bit free-run counter, which is used
for alarm generator.
Features are as follows.
!
Melody generator
The Melody function generates signals of any frequency (4Hz- 5461Hz) based on low-speed clock
(32.768KHz) and outputs several signals from the MLDALM pin.
By connecting a loud speaker outside, Melody tone can sound easily.
!
Alarm generator
The Alarm function generates 8 kinds of alarm waveform having a modulation frequency (4096Hz)
determined by the low-speed clock (32.768KHz). And this waveform is able to invert by setting a value to
a register.
By connecting a loud speaker outside, Alarm tone can sound easily.
And also 5 kinds of fixed cycle (1Hz, 2Hz, 64Hz, 512Hz, 8KHz) interrupts are generated by the free-run
counter which is used for alarm generator.
This section is constituted as follows.
3.14.1
Block diagram
3.14.2
Control registers
3.14.3
Operational description
3.14.3.1
Melody
generator
3.14.3.2 Alarm generator