Sam4s ER-5200 Service Manual page 41
Electronic cash register
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Also See for ER-5200:
- Operation and program manual (7 pages) ,
- Operation and program manual (194 pages) ,
- Service manual (123 pages)
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6-1 Semiconductor Base Diagram
6-1-3 Logic ICs
LOGIC DIAGRAM
1
A0
ADDRESS
2
A1
INPUTS
3
A2
6
CS1
CHIP–
4
SELECT
CS2
INPUTS
5
CS3
FUNCTION TABLE
2
A1
3
A2
4
A3
5
A
A4
DATA
6
A5
PORT
7
A6
8
A7
9
A8
1
DIRECTION
19
OUTPUT ENABLE
2
A1
3
A2
4
A3
5
A4
Data
Inputs
6
A5
7
A6
8
A7
9
A8
1
Output
OE1
OE2
Enables
19
SAM4S ER-5200 Series
15
Y0
14
Y1
13
Y2
12
ACTIVE–LOW
Y3
11
OUTPUTS
Y4
10
Y5
9
Y6
7
Y7
PIN 16 = V CC
PIN 8 = GND
Figure 6-7 74HC138
18
B1
17
B2
16
B3
15
B4
B
14
DATA
B5
PORT
13
B6
12
B7
11
B8
PIN 10 = GND
PIN 20 = V
CC
Figure 6-8 74HC245
18
Y1
17
Y2
16
Y3
15
Y4
Noninverting
Outputs
14
Y5
13
Y6
12
Y7
11
Y8
PIN 20 = V
CC
PIN 10 = GND
Figure 6-9 74HC541
FUNCTION TABLE
Inputs
CS1CS2 CS3 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X
X
H
X
X
X
H
X
H
X
X
X
X
H
L
X
X
X
X
X
H
H
L
L
L
L
L
L
H
L
L
L
L
H
H
H
L
L
L
H
L
H
H
L
L
L
H
H
H
H
L
L
H
L
L
H
H
L
L
H
L
H
H
H
L
L
H
H
L
H
H
L
L
H
H
H
H
H = high level (steady state); L = low level (steady state); X = don't care
FUNCTION TABLE
Control Inputs
Output
Enable
Direction
L
L
Data Transmitted from Bus B to Bus A
L
H
Data Transmitted from Bus A to Bus B
H
X
Buses Isolated (High–Impedance State)
X = don't care
FUNCTION TABLE
Inputs
OE1
OE2
L
L
L
L
H
X
X
H
X = Don't Care
Z = High Impedance
6 Reference Information
Outputs
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
Operation
Output Y
A
L
L
H
H
X
Z
X
Z
6-5
- Quick Links:
- Installation and Operation
- Troubleshooting
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