Pin
No.
SYMBOL SIGNAL
NAME
In/Out Function
39 CLKOUT /RDY In VCC
40 ALE NC Out NOT USE
41 /HOLD /HOLD In Controled by P71
42 /HLDA NC Out NOT USE
43 CBCLK NC Out NOT USE
44 /RD /RD Out Read
45 /BHE NC Out NOT USE
46 /WR /WR Out Write
47 /CS3 CS3 Out Display segment latch
48 /CS2 /RAS1 Out Chip select :for RAM
49 /CS1 BUSY In FMC :Busy
50 /CS0 /ROS1 Out Chip select :for ROM
51 A19 NC Out NOT USE
52 A18 NC Out NOT USE
53 A17 A17 Out Address bus :17
54 A16 A16 Out Address bus :16
55 A15 A15 Out Address bus :15
56 A14 A14 Out Address bus :14
57 A13 A13 Out Address bus :13
58 A12 A12 Out Address bus :12
59 A11 A11 Out Address bus :11
60 A10 A10 Out Address bus :10
61 A9 A9 Out Address bus :9
62 VCC VDD In VDD
63 A8 A8 Out Address bus :8
64 VSS GND In GND
65 A7 A7 Out Address bus :7
66 A6 A6 Out Address bus :6
67 A5 A5 Out Address bus :5
68 A4 A4 Out Address bus :4
69 A3 A3 Out Address bus :3
70 A2 A2 Out Address bus :2
71 A1 A1 Out Address bus :1
72 A0 A0 Out Address bus :0
73 D15 PH4 Out Paper feed motor :Phalse4
74 D14 PH3 Out Paper feed motor :Phalse3
75 D13 PH2 Out Paper feed motor :Phalse2
76 D12 PH1 Out Paper feed motor :Phalse1
77 D11 P13 Out Key/Display :Strobe3
78 D10 P12 Out Key/Display :Strobe2
79 D9 P11 Out Key/Display :Strobe1
80 D8 P10 Out Key/Display :Strobe0
81 D7 D7 InOut Data bus :7
82 D6 D6 InOut Data bus :6
83 D5 D5 InOut Data bus :5
84 D4 D4 InOut Data bus :4
85 D3 D3 InOut Data bus :3
86 D2 D2 InOut Data bus :2
87 D1 D1 InOut Data bus :1
88 D0 D0 InOut Data bus :0
89 AN7 DTS Out Printer head drive
90 AN6 LATCH Out Printer data latch
91 AN5 P105 Out Printer head voltage ON
92 AN4 P104 Out CG ROM Bank
93 AN3 P103 In Head rank
94 AN2 Vref In Base voltage :2.495V
95 AN1 P101 In Printer head voltage check
96 AVSS GND In GND
97 AN0 TH In Print head temperature check
98 VREF VDD In VDD
99 AVCC VDD In VDD
100 SIN4 P97 In Key return :7
3. Clock generator
1) CPU
Two oscillators are connected to the CPU.
The basic clock X3 is supplied from a 12MHz oscillator.
The 12Mhz basic clocks are formed by X3 and W42C21 and inputted
to the Xin pin of the CPU.
If the CPU was not operating properly, the signal does not appear on
this line in most cases.
The sub-clock X1 generates 32.768KHz which is primarily used to
update the internal RTC (real time clock).
During the standby mode, it keeps oscillating to update the clock and
monitoring the power recov-ery.
4. Reset circuit
When the mode switch is placed in the "SRV" position, the reset signal
is sent to the CPU to reset the hardware.
11
10
27P
C135
CPU
XIN
X3
12MHz
X1
32.768KHz
12
18P
C134
14
XOUT
XCOUT
XCIN
R110
330
W42C3103G
IC9
R109
0
CPU
R47
/RESET
C14C104
MODE SWITCH
SRV' position
VDD
11
+
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