Seven segment Display Interface R. Theagarajan. ME., MSc., PhD Rtd. Professor in Engineering email: rtheagarajan@yahoo.com rtrajan59@gmail.com
Display Interface
PA.0 LED
Micro Controller
Display Interface ON, data = 1 OFF, data = 0 PA.0 LED
Micro Controller
Display Interface ON, data = 1 OFF, data = 0 PA.0 LED
Micro Controller
RL
Display Interface
Micro Controller
+5V
PA.1 LED
Display Interface
Micro Controller
+5V
ON, data = 0 OFF, data = 1
PA.1 LED
Display Interface
Micro Controller +5V
RL
ON, data = 0 OFF, data = 1
PA.1 LED
Display Interface
+5V
ON, data = 1 OFF, data = 0
LED
PA.0 RB
T1
RL
Micro Controller
Display Interface +5V
PA.0 RB
T2
LED
RL
Micro Controller
ON, data = 0 OFF, data = 1
+5V
Display Interface
Micro Controller
f
a
e
g
b c
d RB
PA.0 PA.1
T1
RL
PA.7
Transistor Bank
T8
RL
+5V
Display Interface
Micro Controller TB PA PB PC PD
TB
TB
TB
+5V
Display Interface RB
PB.0 PB.1 PB.2 PB.3
T0
T1
T2
PB.1
PB.2
PB.3
T3
Micro Controller
TB PA
TB
TB
TB
+5V
Display Interface PB.0 PB.1
2/4 T0
T1
T2
T3
Micro Controller
TB PA
TB
TB
TB
+5V
Display Interface
7447
Micro Controller PA 4 lines
+5V
Display Interface
7447
Micro Controller
Latch Enable
PA 4 lines
+5V
Display Interface
7447
Micro Controller
7495
PA.0-3 PA.4
4 lines
+5V
Display Interface
Micro Controller
PA.0-3 PA.4 PA.5
4 lines
7447
7447
7495
7495
+5V
Display Interface
Micro Controller
PA.0-3 PA.4
4 lines
7447
7447
7495
7495
+5V
Display Interface
Micro Controller
PA.0-3 PA.4-5
7447
7447
7447
7447
7495
7495
7495
7495
4 lines
2 / 4 Decoder
Display Interface
+5V
C Data SIPO
PA.0 PA.1
Clock
+5V
Display Interface
C Data 74164
SIPO
PA.0 PA.1
Clock
+5V
Display Interface
C Data 74164
SIPO
74164
SIPO
74164
SIPO
PA.0 PA.1
Clock
Display Interface PB.0 PB.1 PB.2 PB.3
Digit Drivers
Micro Controller
SD
SD
SD
PA0 – PA7 Segment Driver
SD
Data for segment display
PA7 dp
PA6 g
PA5 f
ON, data = 1 OFF, data = 0
PA4
PA3
PA2
PA1
PA0
e
d
c
b
a
f
a
e
g d
b c dp
Data for digit display
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
8
7
6
5
4
3
2
1
3
4
1 ON, data = 0 OFF, data = 1
2
5
6
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