— 13 —
Mode OFF¤ OFF (pin No. 78 of CPU)
Voltage 0 5
Mode PRG RF REG CAL X Z
Voltage (V) 4.0 3.3 2.4 1.7 0.9 0.1
except
Pin No. Signal Description In / Out
PW-ON
level
55 P123 Display segment signal (SEG0d) / Key common singnal (KC2) Out Pulse
56 P124 Display segment signal (SEG0e ) / Key common singnal (KC1) Out Pulse
57 P125 Display segment signal (SEG0f) / Key common singnal ( KC0) Out Pulse
58 P126 Display segment signal (SEG0DP) Out Pulse
59 P127 Display segment signal (SEG0g) Out Low
60 RESET Reset signal (RESET) In High
61 P00 Timing pulse from printer (TP) In High
62 P01 TAX switch (TAX-SW ) / PAD condition signal (PAD2) In Low
63 P02 Power down signal (PWD) In Low
64 P03 Display common signal (DG1) Out Pulse
65 P04 Display common signal (DG2) Out Pulse
66 P05 Display common signal (DG3) Out Pulse
67 P06 Display common signal (DG4) Out Pulse
68 VDD VDD terminal (VDD) — 4.5 V
69 X1 Main system clock signal (5.00 MHz) In Pulse
70 X2 Main system clock signal (5.00 MHz) In Pulse
71 IC Vss (GND) — GND
72 XT2 Sub system clock signal (32.768 kHz) In Pulse
73 XT1 Sub system clock signal (32.768 kHz) In Pulse
74 AVDD Power for A/D converter (VDD) — 5 V
75 AVREF0 Standard voltage for A/D converter (VCC) — 5 V
76 P10 Low battery signal (LOW-BATT) In High
77 P11 Mode key condition signal (MODE) In 2.4 V
78 P12 OFF signal of mode switch (OFF-MODE IN) In High
79 P13 PAD condition signal (PAD1) In Low
80 P14 Display segment signal (SEGTR ) / PAD condition signal (PAD3) In / Out Pulse
Note : The "PW-on level" was measured under the following conditions.
Mode switch is REG position.
5-3. Mode key switch status read
The CPU knows the mode swithc status by voltage level of 1 pin No. 77.
The voltage level is down by resistor. Each voltage is as shown bleow.
Voltage level (pin No. 77 of CPU)
20Kq
OFF
To pin No.77
To pin No.78
8.2Kq
3.9Kq
2Kq
820q
PRG
RF
REG
CAL
X
Z
→
To Next Page
Loading...
Need help?
General
