Read Sharp ER-A490 (serv.man4) Service Manual online
3) Block diagram
D7
D6
D5
D4
D3
D2
D1
D0
DB
7
DB
6
DB
5
DB
4
DB
3
DB
2
DB
1
DB
0
Data bus buffer
WRO
RDO
RES
W
R
RES
Read/write
control
control
A5
A4
A3
A2
A1
A0
SL00
CS0
Decorder
control
control
SL01
SL02
SL10
SL11
SL12
SL20
SL21
SL22
SL30
SL31
SL32
TRV
USICH
CS3
CS2
CS1
Chanel
sel
ect
cont
ro
l
CHSL
PX
TO/FROM USART
RX
D
A
T
A
0
TX
E
X1
X2
XO
U
T
TB
CK
Inline
cont
cont
OCS
TCR0
Timer0 control
Timer0
RCVDT0
TCR1
Timer1 control
Timer1
RCVDT1
TCR2
Timer2 control
Timer2
RCVDT2
TCR3
Timer3 control
Timer3
RCVDT3
RTS CNT
RTS1
RTS0
PO
F
F
RS
R
Q
T
RRQ
TR
Q
1
TR
Q
2
Power
supply
cont.
supply
cont.
RCVRDY3
RCVRDY2
RCVRDY1
RCVRDY0
TRNEMP3
TRNEMP2
TRNEMP1
TRNEMP0
Interrupt control
CI
0
CI
1
CI
2
CI
3/
P
2I
CD0
CD1
CD2
CD
3/
P
0
CT
S
0
CT
S
1
CT
S
2
CT
S
3
/P
1
BR
K
0
BR
K
1
BR
K
3
T
R
NRDY
0
T
RNRDY
1
T
RNRDY
2
T
RNRDY
3
AB1
AB0
3 – 2
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