MB86437 Datasheet, PDF (12/35 Pages) Fujitsu Component Limited. – 3 V Single Power Supply Audio Interface Unit (AIU)

MB86437
• Tone output waveform
The D4 data bit at address 01010, 01100 may be used to select either sine-wave or trapezoidal waveforms for tone
output.
VH
D4 = 0
Sine wave
output
VL
1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5
VH
D4 = 1
Trapezoidal wave
output
VL
• Tone output control
Tone output is controlled by addresses 01110 and 00111. Provided TCLK does not stop, sine wave output always
halts close to zero. Also, SW2 controls output muting.
Address 01110
DATA – – – D1 –
(Tone [1] control)
Address 01110
DATA – – – – D0
(Tone [2] control)
Address 00111
DATA – – – D1 –
(SW2 control)
PTBO output
SGC
(sine wave mode)
Tone section output SGC
(sine wave mode)
Single tone
Waveform halts at zero
crossover point.
Mute set by
SW2
Dual tone
Waveform halts at zero
crossover point.
Single tone
: Disable
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