APPENDIX I
$1B Set Time-of-Day Clock
T his co m m a n d se ts th e d ate an d tim e fo r th e in tern al tim e -o f-d ay clock .
T h e v alu es a re p a sse d in p ack ed B in ary C o d ed D ecim al (B C D ) fo rm at. T h is
m ea n s th a t ea ch nibble co n ta in s a n u m b er fro m 0 - 9 , so th a t ea ch by te
yields a tw o -d ig it de c im a l n u m b er. A n y d igit th at isn 't in BC D fo rm at is
tre ated a s a flag in dicatin g th at th e cu rre n t v alu e sh o u ld n 't b e ch an g e d .
Input parameters
Byte
Number Description
1 Y e a r (la s t tw o d igits on ly)
2 M o n th
3 D ay
4 H o u rs (0 -2 4 )
5 M in ute s
6 S eco n d s
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