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Euro-500TX Handy
Pin #.
Signature
7
FM-SEL
8
FM-PGM
9
VPP-GEN
10
NC
11
GND
12
TXD0
13
TXD1
14
RXD0
15
RXD1
16
EKB-DAT
17
EKB-CLK
18
FD0
19
FD1
20
FD2/RW2
21
FD3/RW3
22
GND
23
FD4/RW4
24
FD5/JP4
25
FD6/JP5
26
FD7/JP6
27-34
D0-D7
35
VRAMx
36-43
A0-A7
44
GND
45-55
A8-A18
56
NC
57
GND
58
LCD-SEL
59
LCD-CLK
60
LCD-DATA
61
SYSCLK
62
STBY
63
RST
64
NMI
65
GND
66
EXTAL
67
XTAL
68
VRAMx
69
NC
70
RD
71
HWR
72
NC
73-75
MD0-MD2
76
VRAMx
77
VRAMx
78
TS
79
POWER
Tab. 2.1 Description of the E-500TXN microcontroller signals (cntd.)
14
Service manual
Type
Signal description
O
choice of FM circuits
O
control signal for FM programming
O
signal of program voltage control for FM
NC
I
0 V power supply
O
serial data output, channel 0
O
serial data output, channel 1
I
serial data input, channel 0
I
serial data input, channel 1
I/O
data conductor for communication with external keyboard
O
clock signal for external keyboard
I/O
0.bit FM data
I/O
1.bit FM data
I/O
2.bit FM data / scanning keyboard
I/O
3.bit FM data / scanning keyboard
I
0 V power supply
I/O
4.bit FM data / scanning keyboard
I/O
5.bit FM data / scanning JP4 jumper condition
I/O
6.bit FM data / scanning JP5 jumper condition
I/O
7.bit FM data / scanning JP6 jumper condition
I/O
data bus
I
+5 V power supply
O
address bus
I
0 V power supply
O
address bus
NC
I
0 V power supply
O
activation signal of display controller
O
clock impulse generation for LCD controller
O
datas for processor which control LCD displays
O
system clock output of processor for next usage
I
input for hardware standby mode
I
input for reset signal
I
unmasked interference input
I
0 V power supply
I
input for external oscillator
I
input for external oscillator
I
+5 V power supply
NC
O
signal for reading data from activated circuit
O
signal for recording data to activated circuit
NC
I
choice of processor operating mode
I
feeding of internal D/A and A/D converter
I
reference voltage of internal D/A and A/D converter
I
input for scanning printer head temperature
I
scanning presence and voltage value of primary supply
© Elcom, s. r. o.
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