Sharp UP-3300 Service Manual page 53

Pin Signal
Symbol
No. name
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
2-9. CKDC9 (HD404728A91FS)
1) General description
The CKDC7 is a 4-bit microcomputer developed for the UP-3300 and
provides functions to control the real-time clock, keys, and displays.
The basic functions of the CKDC7 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 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
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 —
9 P1 NC —
10 P2 DP Out Decimal point
11 P3 ID Out Indicator
In/
Function
Out
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
NC
NC
Pin Signal
Symbol
No. name
12 MODR VCC
13 CFSR CFSR
14 KEX0 NC
15 KEX1 NC
16 RQ GND
17 SKR0 VCC
18 ST0 ST0
19 ST1 ST1
20 ST2 ST2
21 ST3 ST3
22 POFF POFF
23 STOP STOP
24 DDIG VCC
25 DCS DCS
26 VCC VCKDC
27 SCK SCK
28 HTS HTS
29 STH STH
30 SDISP GND
31 BUZZ BUZZ
32 DSCK DSCK
33 SRES RESET
34 DS0 DSO
35 SHEN SHEN
36 IRQ KRQ
37 KR0 KR0
38 KR1 KR1
39 KR2 KR2
40 KR3 KR3
41 RESET CKDCR
42 OSC2 OSC2
43 OSC1 OSC1
44 GND GND
45 CL1 CL1
46 CL2 CL2
47 TEST VCKDC
48 G0 G1
49 G1 G2
50 G2 G3
51 G3 G4
52 G4 G5
53 G5 G6
54 G6 G7
55 G7 G8
56 G8 G9
57 G9 G10
58 G10 G11
59 G11 NC
60 PO0 NC
61 PO1 NC
62 PO2 NC
63 PO3 NC
64 SA SA
7 – 20
In/
Function
Out
— +5V
In Clerk key, Feed key, Switch return
signal
Out NC
Out NC
— GND
— +5V
Out Key strobe signal
Out Key strobe signal
Out Key strobe signal
Out Key strobe signal
In Power off signal
In STOP signal
— +5V
Dot display controller chip select
—
DCS
— +5V
In Clock signal
In Key data from host
Out Key data to host
— GND
Out Buzzer
— Dot display controller SCK
Out Reset signal
— Dot display controller SO
Out Shift enable signal
Out Key request signal
In Key return signal
In Key return signal
In Key return signal
In Key return signal
In CKDC reset signal
— Clock
— Clock
— GND
— Time clock
— Time clock
— +5V
Out Display digit signal
Out Display digit signal
Out Display digit signal
Out Display digit signal
Out Display digit signal
Out Display digit signal
Out Display digit signal
Out Display digit signal
Out Display digit signal
Out Display digit signal
Out Display digit signal
Out NC
NC
NC
— NC
— NC
— Segment A