Sharp UP-3300 Service Manual page 62

13. Reset sequence
The reset sequence block diagram is shown below. Note that RESET
signal (system reset) and CKDCR signal (CKDC reset) are different
from each other.
VCC
SLIDE
SW
STOP
CPU
RESET
(System reset)
IRQ0
13-1. Power ON/OFF
The flow of signal processing at the time of the power supply turning
On/Off is as follows:
Table 19
<Power OFF>
Power supply MPCA8
POFF → L
1
IRQ0 → L
2
3
4
Table 20
<Power ON>
Power supply MPCA8
POFF → H
1
2
The table below shows the timing chart.
+5V,+12V
20ms is assured when as power is off.
PG GOOD
(POFF)
200ms
RESET
MIN
(System)
STOP
SHEN
SCK
13-2. MRS, SRV reset
The UP-3300 does not have the mode switch. The procedure for
resetting MRS, SRV is different from that of conventional cash
registers.
in the UP-3300, MRS, SRV resetting is selected and executed by the
key which has bee depressed when the CKDC reset is released to
start the system.
(In the case of MRS, security is added by a key operation equivalent
to a pass word.)
CKDCR
(CKDC reset)
POFF
CKDC9
POFF
POWER
SUPPLY
MPCA8
INT0
Fig. 14
CPU CKDC9
STOP → L
RESET → L
(System reset)
CPU CKDC9
RESET → H
(System reset)
10ms MIN
8 PULSE
Fig. 15
Flow chart
Start
CKDC start
condition read
Hard reset
start?
Yes
*Slide Switch
operation
MRS1 key
ON?
Yes
PASSWORD
judgement
No
OK?
Yes
SRV reset
MRV reset
14. Drawer
The UP-3300 can use up to 2 optional external drawers.
14-1. Drawer solenoid drive
P34 ∼ P37 inside the CPU are allocated for the port output of the
drawer solenoid drive.
Built-in port Signal name
P34
P35
P36
P37
One port corresponds to one drawer. Theoretically, it is possible to
drive multiple drawers at the same time, but this processing must be
inhibited softwarewisely because of power supply capacity and driver
hardware factors. If a power failure is detected, the drawer solenoid
drive must be stopped as soon as possible.
* The drawer solenoid drive time must controlled in the range of 40
ms to 50 ms by the timer.
14-2. Drawer open/close sense
The drawer open/close sense signal is input into the built-in port of
the CPU. the sense signal of an optional drawer sensor is also wired
ORed before inputting.
•
P33=1: Any of the drawers is open.
15. IR communication
Data is exchanged with the MPCA8 using the channel 1 (SCI1) of the
serial communication interface of the CPU.
7 – 26
No
No
Normal
start?
SRV reset
Yes
Recovery
No
MRS2 key
ON?
Yes
PASSWORD
judgement
No
OK?
Yes
SRV reset
10-key position
input sequence
MRV reset
Fig. 16
Table 22
Remarks
DR0 Drawer 1 (optional drawer)
DR1 Drawer 2 (optional drawer)
DR2 Reserved
DR3 Reserved