Sharp CE-150 - Page 309

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D. Data transfer to the audio cassette tape
Format of data transferred to the audio casse nc tape con sis ts of a s tart bit, 8 bits of
d ata. and t wo stop bits. with c it e modulation signal generated from the SOO
output.
No r mal scfi31 data tr ans fer SXO ~ 0 0 I
SD O l lll lll I I I l I llll llll llll l I I JUlUUl l I I I I I ll llU J
Audio casscuc da 1a 1 ra nsfer
--7 ~- -- -OA T A -- -- -l> S T O?
ST AR T
CLO
I I I I I I I I I I I I I
Assume now that normal serial data ou tput is to be S XO . the mod ul a ti on clo ck to
cit e data I to be FX. the m odu la tion clock to the data Oto be FY.and audio cassette
tape data output LO he S l)O. then th t: foll<.l\ Vi ng equation c<nnp ri ses:
SOO = SXO · FX + SXO · FY
Wherc<i s. FX and FY c an be set indepe nd ently to 1/ 64. I/ 128 . l/ 256, l/ 512 or
II 1024 of the basic clock by mean~ of pro gramming.
The ser ia l transmit clock CLO can be pro grammed as di s.c ussed in Item A.
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