Sharp PC-1500 Technical Reference Manual page 74

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D. Data transfer to the audio cassette tape
Format of data transferred to the audio cassenc tape consists of a start bit, 8 bits of
data. and two stop bits. with
cite
modulation signal generated from the SOO
output.
Normal scfi31 data transfer SXO
~
0 0
I
SDO
lllllll I I I l I l l lll l l l lllll I IJUlUUl l I I I I I l l llU J
Audio casscu c da1a 1ransfer
--7 ~----OA TA -----l> S TO?
START
CLO
I I I I I I I I I I I I I
Assume now that normal serial data output is to be S XO. the modulation clock to
cite
data I to be FX. the modulation clock to the data Oto be FY.and audio cassette
tape data output L O he S l)O. then tht: foll<.l\Ving equation c<nnprises:
SOO
=
SXO · FX
+
SXO · FY
Wherc<is. FX and FY can be set independently to 1/ 64. I / 128. l/ 256, l/ 512 or
II 1024 of the basic clock by
mean~
of programming.
The serial transmit clock CLO can be programmed as dis.cussed in Item A.
69
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