Specifications

S1C62N82 TECHNICAL HARDWARE EPSON I-91
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Melody Generator)
(4)R12:DC output
(Melody output: Normal LOW level)
Melody is output from the MO terminal and from the
R12 terminal, data written on the "R12" register is
output. The MO terminal is a complementary output
terminal and goes low when melody is not played.
Complementary output or Pch open-drain output may
be selected for the R12 terminal by mask option.
(5)R12:Melody reverse output
(Melody output: Normal LOW level)
Using MO and R12 terminals, the piezo buzzer may be
directly driven. During playing, reverse signal of the
MO terminal is output from the R12 terminal. Both
terminals go low when melody is not being played. The
output configuration of both terminals becomes com-
plementary.
(6)R12:With envelope function
(Melody output: Normal LOW level)
Envelope function can be implemented by connecting
an external capacitor to the R12 terminal. Melody is
output from the MO terminal and the signal which will
recharge the external capacitor will be output from the
R12 terminal. The R12 electric potential will turn out
supplying the positive electric potential of the MO
terminal output and when the melody signal goes low, it
will pass the analog switch and will be supplied to the
MO terminal. For details regarding the envelope func-
tion, refer to "Envelope function".