Sharp UP-600 Service Manual page 39

3) CKDC9 (HD404728B02FS)
3)-1. General description
The CKDC9 is a 4-bit microcomputer developed for the UP-600 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 dis-
play 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 is-
sue, and counter overflow
3)-2. Pin description
Pin Signal In/
Symbol
No. name Out
1 SB SB Out
2 SC SC Out
3 SD SD Out
4 SE SE Out
5 SF SF Out
6 SG SG Out
7 P4 AP Out
8 P0 NC —
9 P1 NC —
10 P2 DP Out
11 P3 ID Out
12 MODR VCC —
13 CFSR CFSR In
14 KEX0 NC Out
15 KEX1 NC Out
16 RQ GND —
17 SKR0 VCC —
18 ST0 ST0 Out
19 ST1 ST1 Out
20 ST2 ST2 Out
21 ST3 ST3 Out
22 POFF POFF In
23 STOP STOP In
24 DDIG VCC —
Function
Segment B
Segment C
Segment D
Segment E
Segment F
Segment G
NC
NC
Decimal point
Indicator
+5V
Clerk key, Feed key, Switch
return signal
NC
NC
GND
+5V
Key strobe signal
Key strobe signal
Key strobe signal
Key strobe signal
Power off signal
STOP signal
+5V
Pin Signal In/
Symbol
No. name Out
25 DCS DCS —
26 VCC VCKDC —
27 SCK SCK In
28 HTS HTS In
29 STH STH Out
30 SDISP GND —
31 BUZZ BUZZ Out
32 DSCK DSCK —
33 SRES RESET Out
34 DS0 DSO —
35 SHEN SHEN Out
36 IRQ KRQ Out
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
49 G1 G2 Out
50 G2 G3 Out
51 G3 G4 Out
52 G4 G5 Out
53 G5 G6 Out
54 G6 G7 Out
55 G7 G8 Out
56 G8 G9 Out
57 G9 G10 Out
58 G10 G11 Out
59 G11 NC Out
60 PO0 NC
61 PO1 NC
62 PO2 NC —
63 PO3 NC —
64 SA SA —
4) LCD CONTROLLER (M66271FB)
4)-1. Pin configration
MPUCLK 9
OSC1 78
CP 66
LP 67
UD0 69
UD1 70
UD2 71
UD3 72
FLM 68
RESET 11
WAIT 7
MCS 6
RD 5
LWR 4
HWR 3
IOCS 2
Function
Dot display controller chip select
DCS
+5V
Clock signal
Key data from host
Key data to host
GND
Buzzer
Dot display controller SCK
Reset signal
Dot display controller SO
Shift enable signal
Key request signal
Key return signal
Key return signal
Key return signal
Key return signal
CKDC reset signal
Clock
Clock
GND
Time clock
Time clock
+5V
Display digit signal
Display digit signal
Display digit signal
Display digit signal
Display digit signal
Display digit signal
Display digit signal
Display digit signal
Display digit signal
Display digit signal
Display digit signal
NC
NC
NC
NC
NC
Segment A
31 A13
30 A12
29 A11
28 A10
27 A9
26 A8
22 A7
21 A6
20 A5
19 A4
18 A3
17 A2
16 A1
15 A0
62 M
61 LCDENB