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