Sharp PC-1500 - Page 74

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D. Da ta tra ns fer to the audio cassette tape
Format of data tran sferred to the audio cassette tape cons is ts of a st art bit, 8 bits of
data, and two stop bits,
wi th the modulation signal generated from t he SDO
output.
. f sxo
Norn1al se ria l data t ran s er
~ o ol
s
00
lli ~ lill LW llillm ll ll I I lll ll ll I I I I I I I I lll llll ll llll
Aud io cassette data transfer
-7 ~- --- DA T A-- --~ S TOP
ST ART
CLO
I I I I I I I I I I I I I
Assume now that normal serial data out put is to be SXO , the mod ul ation clock to
the
data l to be FX , the modulation clock to the da ta 0 to be FY, and audio cassette
tape
data output to be SDO, th en the following equati on comp ri ses:
SD O = SXO · FX + SXO · FY
Whereas, FX and FY can be set independently to 1/64, l / 128. 1/ 256, 1/512 or
I/ 1024 of th e basic clock by means of pr ogramming.
The serial transmit clo
ck CLO can be programmed as discussed in Item A.
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