Read Sharp ER-A450 (serv.man2) Service Manual online
2) Block diagram
Fig. 2-2
P47
FTI2
P45
FTI1
P43
P42
P41/TMCI
P40
P37
P36
P35
P34
P33
BREQ
BACK
WAIT
P27/A23
P26/A22
P25/A21
P24/A20
P23/A19
P22/A18
P21/A17
P20/A16
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
VCC
VCC
VCC
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
AVCC
AVSS
MD2
MD1
MD0
RES
STBY
NMI
AS
RD
HWR
LWR
RFSH
EXTAL
XTAL
E
P17
P16
P15
P14
P13
P12
P11
P10
D7
D6
D5
D4
D3
D2
D1
D0
STOP/P57
P56
FM
RS
P54
P53
P52
P51
P50
P67
P66
RS/P65
RR/P64
CD/P63
CS/P62
DR/P61
ER/P60
P73
AN2
AN1
AN0
TX
D2
RXD2
TX
D1
RXD1
SCK2
IR
Q2
IR
Q1
IR
Q0
H8/500 CPU
DTC
Serial
communication
interface x 2ch
communication
interface x 2ch
8bit timer
16bit free running
timer x 2ch
timer x 2ch
Refresh controller
Wait state
controller
controller
A/D convertor
Interruption controller
Clock
oscillator
oscillator
Watch
dog timer
dog timer
Data bus
Port 1
Data bus (Lower)
Data bus (Upper)
Address bus
Port 2
Port 3
Port 4
Port 5
Port 6
Port 7
Port 8
Address bus
X
4 – 3
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