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Cash Register
ER-A750
Service manual
Sharp ER-A750 Service Manual page 33
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:
Programming manual
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,
Installation manual
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,
Programming manual
(40 pages)
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2) Block diagram
EXTAL
XTAL
X
E
MD2
MD1
MD0
RES
STBY
NMI
AS
RD
HWR
LWR
RFSH
VCC
VCC
VCC
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
AVCC
AVSS
Data bus
Clock
Watch
oscillator
dog timer
H8/500 CPU
Interruption controller
Refresh controller
Wait state
controller
A/D convertor
Port 8
Port 1
DTC
16bit free running
timer x 2ch
8bit timer
Serial
communication
interface x 2ch
Port 7
Port 6
Fig. 2-2
7 – 3
P27/A23
P26/A22
P25/A21
P24/A20
P23/A19
P22/A18
P21/A17
P20/A16
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
P37
P36
P35
P34
P33
BREQ
BACK
WAIT
P47
P46
P45
P44
P43
P42
P41/TMCI
P40
Port 5
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. Diagnostics Specifications
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Er-A750
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Table of Contents
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