Read Sharp UP-3300 (serv.man13) Service Manual online
4
Send the data "B" to the UP-P16DP with shift clock’s added by the
HOST. Then, sen the previous data "A" in the UP-P16DP to the
HOST.
HOST. Then, sen the previous data "A" in the UP-P16DP to the
HOST.
The host cash register transfers data to UP-P16DP after eigth
shift clocks. In this event, the contents of the UP-P16DP shift
register (data A) is not destroyed.
shift clocks. In this event, the contents of the UP-P16DP shift
register (data A) is not destroyed.
5
The HOST checks if the returned data "A" are properly trans-
mitted. The data "B" returns to the HOST to be checked after a
next data or a dummy data are sent.
mitted. The data "B" returns to the HOST to be checked after a
next data or a dummy data are sent.
2) CKDC9
→
host (repeated transmission of the same
data twice)
1
Set the data "A" in the CKDC9 side shift register.
2
Sent the data "A" on the shift clock and read it on the host side.
3
Set the dame data "A" in the CKDC9 side shift register.
4
Again, sent the data "A" on the shift clock.
5
On the host side, compare the data "A" read in
2
to check if the
transmission was achieved properly.
2-2-6. UP-P16DP operation check
The /SHEN2A signal is used to check lock up of the UP-P16DP.
Normally, it will complete within 2msec before /SHEN2A is set after
the HOST completed data transmission. If /SHEN2A was not
received within the predetermined time, it will be error processed as
an error.
Normally, it will complete within 2msec before /SHEN2A is set after
the HOST completed data transmission. If /SHEN2A was not
received within the predetermined time, it will be error processed as
an error.
B
A
B
A
HOST
UP-P16DP
A
Unpredicatable
HOST
CKDC9
A
HOST
CKDC9
A
HOST
CKDC9
A
HOST
CKDC9
/SHEN2A
/SCK2A
30µ s ~ 2mms
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