2. PCU
A. PCU block diagram
B. Main device
(1) CPU
a. Block diagram
Sensors/Detectors
Control signal
High voltage
unit
AMP (IC14)
Operation unit
Key signal/Display signal
Scanner control signal
CPU (IC1)
Motor control signal
Scanner unit
Video signal
Data signal
NV-RAM
(IC15)
Address/Data signal
Data/Control signal
ICU
Data/Control signal
G/A (IC10)
Drive signal
DRIVER
(IC3/4/5/6/8/9)
Loads
DRIVER
(IC12)
Toner
motor (black)
DRIVER
(IC11)
DRIVER
(IC7)
Paper feed
motor
DRIVER
(IC2)
DRIVER
(IC13)
Toner
motor (Color)
Drum motor
Fusing motor
NMI
INTP
TO
10
TCLR
4
TI
2
TIUD
TCUD
SCK
3
SO
2
SO/SB0
SI
2
SI/SB1
TXD
RXD
RTP
8
AN
I
8
AD
TRG
AV
RE
F
A
VSS
AVD
D
4
AN
O
2
AV
RE
F
2
PW
M
2
WD
T
O
VS
S
4
VD
D
4
8P
1
0
4
P9
8
P8
8
P7
8
P6
8
P5
8
P4
8
P3
8
P2
8
P1
8
D0-D7
8
AD8-AD15
17
A0-A16
8
AD0-AD7
CLKOUT
X1
X2
RESET
ASTB
RD
LWR
HWR
WAIT
MODE1
MODE0/ VPP
PGM
CE
OE
PROGAMMABLE
INTERRUPT
CONTROLLER
5
TIMER/COUNTER UNIT
(REALTIME
PULSE UNIT)
SERIAL
INTERFACE
(SBI)
(UART)
REALTIME OUTPUT
PORT
A/D
CONVERTER
D/A
CONVERTER
PWM
WATCHDOG
TIMER
PORT
8
P0
BCU
1792 x 8
ECC
(Note 2)
48K X 8
MICRO ROM
MICRO
SEQUENCE
CONTROL
ALU
ROM(Note 1)
EXU
SYSTEM
CONTROL
&
BUS
CONTROL
&
PREFETCH
CONTROL
GENERAL
REGISTERS
128 x 8
&
DATA
MEMORY
128 x 8
Main RAM
Peripheral RAM
Remark
: µPD78P356 PROM programming mode
(Note 1) : µPD78355 does not include ROM.
µPD78356 includes 48KByte PROM.
(Note 2) : The ECC circuit included only in µPD78P356.
SHARP SERVICE MANUAL JX8200SM [13] ELECTRICAL SECTION
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