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5-3. Printer drive circuit
RP
Pt
PT
MD
HD
When the CPU starts printing, CPU sends MD signal to rotate motor unit.
Then the printer sends back the RP(reset pulse),PT and PT (Timing pulse) to CPU.
After CPU receives RP,PT andPT, CPU knows the position of printin wheel.
And then, CPU sends HD signal to operate the printing magnet when the character selected.
The CPU counts the TP signal to select the character.
5-4. Pin description (CPU uPD78044FGF)
Pin No.
Signal
1 P94/FIP6
2 P93/FIP5
3 P92/FIP4
4 P91/FIP3
5 P90/FIP2
6 P81/FIP1
7 P80/FIP0
8 VDD
9 P27/SCK0
10 P26/SO0/SB1 In/Out
11 P25/SI0/SB0
12 P24/BUSY
13 P23/STB
14 P22/SCK1
15 P21/SO1
16 P20/SI1
17 RESET
18 P74
19 P73
20 AVSS
21 P17/ANI7
22 P16/ANI6
23 P15/ANI5
24 P14/ANI4
25 P13/ANI3
26 P12/ANI2
27 P11/ANI1
28 P10/ANI0
29 AVDD
30 AVREF
31 XT1
32 XT2
33 VSS
34 X1
35 X2
36 P37
37 P36/BUZ
38 P35/PCL
39 P34/T12
40 P33/T11
Mode SW
Mode SW
In/Out
REG
OFF
Out
Pulse
-24V
Out
Pulse
-24V
Out
Pulse
-24V
Out
Pulse
-24V
Out
Pulse
-24V
Out
Pulse
-24V
Out
Pulse
-24V
-
+5V
+5V
In/Out
-
-
-
-
In/Out
-
-
In/Out
-
-
Out
H
H
Out
L
H
Out
L
H
In
H
H
In
H
H
Out
H
H
Out
L
H
-
GND
GND
In
GND
GND
In
GND
GND
Out
L
L
In
GND
GND
In
GND
GND
In
GND
GND
In
GND
GND
In
H
H
-
H
H
In
L
L
In
Pulse
Pulse
-
Pulse
Pulse
-
GND
GND
In
Pulse
L
-
Pulse
H
In
L
L
Out
L
L
In
L
L
In
L
L
In
L
L
— 10 —
CPU
Pin No.44
Pin No.45
Pin No.47
Pin No.62
Pin No.63
AC cord
Description
Plug off
L
Display digit signal DG7
L
Display digit signal DG6
L
Display digit signal DG5
L
Display digit signal DG4
L
Display digit signal DG3
L
Display digit signal DG2
L
Display digit signal DG1
+5V
VDD terminal
-
Not used
-
Not used
-
Not used
-
Not used
H
Strobe signal for AVREF
H
SK signal for EEPROM
H
DI signal for EEPROM
H
DO signal for EEPROM
H
Reset signal
L
Drawer open signal
H
Common signal for PAD condition
GND
GND for AD converter
GND
GND
GND
GND
H
Chip enable signal for EEPROM
GND
GND
GND
GND
GND
GND
GND
GND
H
Low battery detection terminal
H
Power for AD converter
L
Voltage for AD converter (VDD)
Pulse
Sub system clock
Pulse
Sub system clock
GND
GND
L
Main system clock
H
Main system clock
L
Mode switch position (OFF)
L
Buzzer signal
L
Mode switch position (Z)
L
Mode switch position (X)
L
Mode switch position (CAL)
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