Sharp UP-3301 Service Manual page 57

Pin Signal
Symbol
No. name
113 MD8 MD8
114 MD7 MD7
115 MD6 MD6
116 MD5 MD5
117 MD4 MD4
118 MD3 MD3
119 MD2 MD2
120 MD1 MD1
121 MD0 MD0
122 GND GND
123 VDD VCC
124 RESET RESET
125 MINTEST GND
126 TEST GND
127 GND GND
128 XO XO
2-6. CKDC9 (HD404728A91FS)
1) General description
The CKDC7 is a 4-bit microcomputer developed for the UP-3301 and
provides functions to control the real-time clock, keys, and displays.
The basic functions of the CKDC9 are shown below.
Keys: The CKDC9 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 is buffered. )
Switches: Mode switch with 14 positions maximum
8-bit clerk (cashier) switch (not used)
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, mode switch position change, alarm
issue, and counter overflow
2) Pin description
Pin Signal In/
Symbol
No. name Out
1 SB SB Out Segment B
2 SC SC Out Segment C
3 SD SD Out Segment D
4 SE SE Out Segment E
5 SF SF Out Segment F
6 SG SG Out Segment G
7 P4 AP Out
8 P0 NC – NC
In/Out Function
I/O Memory data
I/O Memory data
I/O Memory data
I/O Memory data
I/O Memory data
I/O Memory data
I/O Memory data
I/O Memory data
I/O Memory data
In GND
In +5V
In Reset signal
In GND
In GND
In GND
Out 25.175MHz
Function
UP-3301US CIRCUIT DESCRIPTION
Pin Signal In/
Symbol
No. name Out
9 P1 NC
10 P2 DP Out Decimal point
11 P3 ID Out Indicator
12 MODR VCC
13 CFSR CFSR In
14 KEX0 NC Out NC
15 KEX1 NC Out NC
16 RQ GND
17 SKR0 VCC
18 ST0 ST0 Out Key strobe signal
19 ST1 ST1 Out Key strobe signal
20 ST2 ST2 Out Key strobe signal
21 ST3 ST3 Out Key strobe signal
22 POFF POFF In
23 STOP STOP In
24 DDIG VCC
25 DCS DCS
26 VCC VCKDC
27 SCK SCK In
28 HTS HTS In
29 STH STH Out Key data to host
30 SDISP GND
31 BUZZ BUZZ Out Buzzer
32 DSCK DSCK
33 SRES RESET Out Reset signal
34 DS0 DSO
35 SHEN SHEN Out Shift enable signal
36 IRQ KRQ Out Key request signal
37 KR0 KR0 In
38 KR1 KR1 In
39 KR2 KR2 In
40 KR3 KR3 In
41 RESET CKDCR In
42 OSC2 OSC2
43 OSC1 OSC1
44 GND GND
45 CL1 CL1
46 CL2 CL2
47 TEST VCKDC
48 G0 G1 Out Display digit signal
49 G1 G2 Out Display digit signal
50 G2 G3 Out Display digit signal
51 G3 G4 Out Display digit signal
52 G4 G5 Out Display digit signal
53 G5 G6 Out Display digit signal
54 G6 G7 Out Display digit signal
55 G7 G8 Out Display digit signal
56 G8 G9 Out Display digit signal
57 G9 G10 Out Display digit signal
58 G10 G11 Out Display digit signal
59 G11 NC Out NC
60 PO0 NC
61 PO1 NC
62 PO2 NC
63 PO3 NC
64 SA SA
– 55 –
Function
– NC
– +5V
Clerk key, Feed key, Switch return signal
– GND
– +5V
Power off signal
STOP signal
– +5V
– Dot display controller chip select DCS
– +5V
Clock signal
Key data from host
– GND
– Dot display controller SCK
– Dot display controller SO
Key return signal
Key return signal
Key return signal
Key return signal
CKDC reset signal
– Clock
– Clock
– GND
– Time clock
– Time clock
– +5V
NC
NC
– NC
– NC
– Segment A