Displays; Fig. 2.24 The Display Control In The Euro-500Tx Handy - ELCOM Euro-500 Handy Series Service Manual

Euro-500TX Handy

2.3.3 Displays

The Euro-500TX contains two display units. The cashier display is an alphanumerical LCD and the custo-
mer display is segment LCD. The Greek version of the ECR features both displays (cashier and customer)
as alphanumerical.
Alphanumerical display
The display is controlled by the independent 87LPC762 microcontroller. The 87LPC762 microcontroller
receives the data from the main E-500TXN microcontroller via a serial line that is provided by SEL, CLK
and DATA signals. This microcontroller is located on an individual PCB underneath the alphanumerical LCD
module. The display control signals are described in the table 2.1.
The two-line alphanumerical LCD is backlit by default. One row is able to display up to 20 characters. The
display is constructed as a separate PCB that contains the display itself, the backlight unit, and the display
controller. The backlight option can be controlled using keyboard (press [Multiply] key in "X" mode). Indivi-
dual backlight modes depend from the ECR version. Maximum current consumption due the alphanumeri-
cal LCD backlight is 150 mA and for segmented LCD is 200 mA.
Segment display
It is an LCD with 96 segments. The display control in the ECR is switched using the COM1 and COM2
signals. Every display is equipped with its own NJU6432B controller.
The display units can be optionally fitted with the backlight panels (D1) that are controlled by display con-
troller (SEG49, SEG50). The backlight option can be controlled using keyboard (press [Multiply] key in "X"
mode). Maximum single backlight panel current consumption is 250 mA.
The 87LPC762 microcontroller
The ECR Euro-500TX employs the 8-bit 87LPC762 microcontroller that provides the control for LCDs.
BD2
VCC VCCx
BCM4532
C9
C7 C8
100n 100n 100u/10V
BD14
VCC1 VCC1X
EBM2012
C10
100n
VCCx
R1 R2 R3
47k 47k 47k
SEL
DATA
CLK
SEG-SEL
SEG-CLK
SEG-DATA
C2
15p Q1
11,0592MHz
C3
15p
BD3
LCD-SEL
EBM2012
BD4
LCD-CLK
EBM2012
BD5
LCD-DATA
EBM2012
C4 C5 C6
1n
100p 1n
20
Service manual
VCCx
R6
3R9 (2R2)
A
K
R9
T1
BL
2SK1079
47k
U1
12 1 E
P1.0/TxD P0.0
11 20 RS
P1.1/RxD P0.1
10 19 R/W
P1.2/T0/SCL P0.2
9 18
BL
P1.3/INT0/SDA P0.3
8 17
DB4
P1.4/INT1 P0.4
4 16
DB5
P1.5/RST P0.5
3 14
DB6
P1.6 P0.6
2 13 DB7
P1.7 P0.7/T1
BD1
7 15
P2.0/X2 VCC
EBM2012
C1
100n
6 5
P2.1/X1 GND
87LPC762
SEL
VCCx
CLK
U2
DATA
2
VCC
RST
3
GND
V6340/C

Fig. 2.24 The display control in the Euro-500TX Handy

K
15
BD7
DB7
13
EBM2012 BD9
DB5
11
EBM2012
9
7
BD11
E
6
BD13
EBM2012
RS
4
2X8pinHEADER
BD15 EBM2012
VCC2
2
EBM2012
C11
100n
SEG-SEL
BD18
SEG-CLK
VCC2
EBM2012
SEG-DATA
GND
R11
Q3
BC857
10k
R5
Q2
1
BC817
10k
© Elcom, s. r. o.
BD6
14
BD8 EBM2012
12
JumpCONN
EBM2012
BD10
10
16 15
EBM2012
14 13
12 11
8
10 9
8 7
6 5 BD12
5
4 3
EBM2012 R4
2 1
3
1k
BD16
VCCx
2ndSegDISP
EBM2012
1
GND
BD17
2
3
EBM2012
4
5
BD19
AVA 5400-5P S
EBM2012
2ndAlphaDISP
GND
1
2
2
3
3
4
4
5
5
6
6
7
7
8
VCC2
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
MOLEX53047-1510
A
DB6
DB4
R/W
GND