Service manual

Pin
No.
Signal
name
In/
Out
Function
105 DAX2 — Nu
106 MCR1 — Nu
107 MCR2 — Nu
108 WAIT Out Wait request signal
109 EXWAIT In External wait control input signal
110 RA18 Out Nu
111 RA17 Out Nu
112 GND — GND
113 RA16 Out Nu
114 RA15 Out Nu
115 RDO Out Expansion RD signal
Option
116 WRO Out Expansion WR signal
117 EXINT3 In Expansion interruption signal 3
Option
118 EXINT2 In Expansion interruption signal 2
119 EXINT1 In Expansion interruption signal 1
120 EXINT0 In Expansion interruption signal 0
121 OPTCS Out
Chip select base signal for expansion
option
122 ROS1 Out ROM 1 chip select signal
123 ROS2 Out ROM 2 chip select signal
124 RAS2 Out RAM 2 chip select signal
125 RAS1 Out RAM 1 ship select signal
126 RJRST In Printer reset signal
127 RJTMG In Printer timing signal
128 DT4 Out Printer dot signal 4
129 DT3 Out Printer dot signal 3
130 DT2 Out Printer dot signal 2
131 DT1 Out Printer dot signal 1
132 GND — GND
133 DT7 Out Printer dot signal 7
134 DT6 Out Printer dot signal 6
135 DT5 Out Printer dot signal 5
136 MTD Out Printer motor drive signal
137 MTD Out Printer motor drive signal
138 DOT9 — Printer dot signal 9 (NU)
139 DOT8 — Printer dot signal 8 (NU)
140 SYNC — Nu (+5V)
141 ASKRX — I/R input from I/R unit
142 VCC — +5V
143 GND — GND
144 — — Nu
145 RAS3 Out Nu
146 RJMTR In Printer motor lock detection signal (NU)
147 SLMTD In Nu
148 SLMTS In Nu
149 SLMTR In GND
150 HTS2 Out Nu
151 SCK2 Out Nu
152 STH2 In Nu
153 — — Nu
154 — — Nu
155 — — Nu
156 — — Nu
157 — — Nu
158 LCDWT — Nu
159 DOTEN Out Dot drive enable signal
160 RASP — Nu
2-3. CKDC6 (HD404728A91FS)
1) General description
The CKDC6 is a 4-bit microcomputer developed for the ER-A460/
A470 and provides functions to control the real-time clock, keys, and
displays. The basic functions of the CKDC6 are shown below.
Keys: The CKDC6 is capable of controlling a maximum of 256
momentary keys. (Sharp 2-key rollover control)
Simultaneous scanning of key and switch
(When a key is scanned, the state of a mode and clerk
switch is also buffered. The host can scan the state of
switch together with the key entry data at the same time
the key is scanned.)
Switches: Mode switch with 14 positions maximum
8-bit clerk (cashier) switch
2-bit feed switch
1-bit receipt on/off switch
1-bit option switch
4-bit general-purpose switch (1-bit is used for keyboard
select)
Displays: 16-column dot display
12-column 7-segment display (column digit selectable)
All column blink controlled for the dot and 7-segment
display decimal point and indicators
Programmable patterns for 7-segment display:
Four patterns
Internal driver for 7-segment display
Buzzer: Single tone control
Clock: Year, month, day of month, day of week, hour, minute
Alarm: Hour, minute
Interrupt request (event control):
Detection of key input, switch position change, alarm
issue, and counter overflow
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