Service manual
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.
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 CPU CKDC9
1
POFF L
2
IRQ0 L
3
STOP L
4
RESET L
(System reset)
Table 20
<Power ON>
Power supply MPCA8 CPU CKDC9
1
POFF H
2
RESET H
(System reset)
The table below shows the timing chart.
13-2. MRS, SRV reset
The ER-A770 does not have the mode switch. The procedure for
resetting MRS, SRV is different from that of conventional cash regis-
ters.
in the ER-A770, 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.)
Flow chart
14. Drawer
The ER-A770 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 Remarks
P34
DR0 Drawer 1 (optional drawer)
P35
DR1 Drawer 2 (optional drawer)
P36
DR2 Reserved
P37
DR3 Reserved
One port corresponds to one drawer. Theoretically, it is possible to
drive multiple drawers at the same time, but this processing must be
controlled by software 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 logi-
cally wired ORed before inputting.
• P33=1: Any of the drawers is open.
POFF
CKDCR
(CKDC reset)
VCC
POFF
INT0
IRQ0
STOP
RESET
(System reset)
SLIDE
SW
CKDC9
MPCA8
POWER
SUPPLY
CPU
Fig. 14
PG GOOD
RESET
STOP
SHEN
SCK
+5V,+12V
(POFF)
10ms MIN
8 PULSE
(System)
Power supply On Power supply Off
Fig. 15
Yes
No
*Slide Switch
operation
MRS1 key
ON?
MRS2 key
ON?
CKDC start
SRV reset
MR
S reset
Start
Normal
start?
condition read
Recovery
No
Yes
OK?
OK?
SRV reset
SRV reset
No
Yes
Yes
No
Yes
Yes
No
Hard reset
start?
PASSWORD
judgement
judgement
10-key position
input sequence
MR
S reset
PASSWORD
Fig. 16