Block Diagram; Signal Description - Sharp CE-126P Service Manual

5.BLOCK DIAGRAM

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6.CPU(UPD7506G515
SIGNAL DESCRIPTI
Pin No. Signal Name
P03 SEL2
POO SEL1
P13 BUSY
P12 XOUT
Pll DOUT
Pl0 DOUT
P23
ACL/SEL1
P22
CS/SEL2
P21
REM02
RIW
.20
P43
PIS
P42
NORMAL PAPERI
THERMAL PAPER
P41
LOWBATTERY
P40
ACK
P53 03
P52 02
P51 01
, P50 00
I
REM01
P63
P62 ACK
P61 OIN
P60 BUSY
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F.AR
Xi"
X01II
Basy
Dout
DiD
ACK
SELI
SEL2
Driver
HI-1
)
ON
ln/Out
In Select
Select
In
Handshake, active high
In
Device select, active high
In
In Data, active high
In Printer error
Out Hilt!: ACL
Out Hilt!: chip select
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Remote off
Out
Out High: read, "High to low transition: write
In Data transfer mode
Hi!ta: parallel
In PCU select
High: normal paper PCU
In Low banery check
High: normal
Handshake (PCU to printer CPU)
In
ln/Out Dm line between CPU and PCU
InlOut
Data line between CPU and PCU
InlOut Dm line between CPU and PCU
InlOut
Data-line between CPU and PCU
Out Remote on ~
Out Handshake (to host CPU), active high
Out Printer error (to host CPU)
High: printer error
Out Handshake (printer CPU to PCU), active high
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liREMOTEl
circuit
~
Low battery
~IIIC
1'21 P63
PI!
P23
PI3
P22
CPU
Pli
PSI P2I)
P62
PS)
POIl POl
P53
f
J
DI-4 R/'WIlJSYSEL
HI-1
IDF
T
I
TI
PD
Zero-
I. C
Crass
I.C
T
11
PRINTER
Description
Low: nomal
Low: non-select
Remote off pulse generation
Low: serial
Low: thermal paper PCU
Low: low battery
MSB (High ..•..• 1, Low ..••.• 0)
(High •...•• 1, Low ...... 0)
(High ...... 1, Low .....• 0)
LSB (High •...•. 1, Low ..•... 0)
Remote on pulse generation
low: nonnal
CE 12S-P
I
1
PCU
R
-
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