Sharp R-9570 Service Manual page 11

R-9570
DESCRIPTION OF LSI
LS I (K-l. IX2429YA)
The I/O signals of the LSI (IX2429YA) are detailed in the following tables.
EO
El
E2
E3
E4
E5
E6
E7
E8
E9
El0
El1
El2
El3
El4
El5
El6
El7
El8
El9
E20
E21
E22
E23
EX
X
RESET
SO/E24
SI/E25
E26
IRQ/E27
vss
25
26
27
28
29
30
31
32
LSI
ICI
IX2429YA
vcc
N.C
R15
R14
R13
R12
Rll
RlO
R9
R8
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
AVcc
AVa +
AVR-
AVss
E36
E37
R7
R6
R5
R4
R3
R2
Rl
RO
Figure T12. Relationship between pin Nos. and Signals (LSI: IX2429YA)
Pin No. Signal
I/O
Description
----"
1 EO OUT Digit selection signal.
pl5oHzl
The relation between digit signal and digit are
I 2 mru
2 El OUT
as follows:
Digit Signal Digit
EO ii'____ ---!__--- ,'
3 E2 OUT
EO . . . . . . . . . . . . . . . . . . . . . . . . 1 st
El . . . . . . . . . . . . . . . . . . . . . . . . 2nd
LJ-L-
* 0
2mrec
4 E3 OUT
E2 . . . . . . . . . . . . . . . . . . . . . . . . 3rd
E3 .I...................... 4th
L.--rL
5 E4 OUT
E4 . . . . . . . . . . . . . . . . . . . . . . . . 5th
E5 6th
=n
. . . . . . . . . . . . . . . . . . . . . . . .
6 E5 OUT
Normally, one pulse is output in every
-n
\
fi period, and input to the grid of the GLlD
Fluorescent Display.
ES
-2N
~~
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