Read Sharp XE-A303 (serv.man4) Service Manual online
XE-A303 (V)
HARDWARE DESCRIPTION
– 6 –
When IPL: Memory expansion mode (1MByte mode, PM13=0)
For the physical address of the external RAM, refer to the descriptions
on the normal operation.
(The external RAM can be seen similarly in the normal operation mode
and in the IPL mode.)
and in the IPL mode.)
4. CPU PORT
4-1. CPU PORT LIST
00000h SFR
00400h Internal RAM 12KByte
(00400h-033FFh)
033FFh
03400h
03400h
04000h POPUP Display 04000h /CS3 16K
Front Display 04001h
08000h External RAM
External RAM
External ROM
/CS2 124K
124KByte/512KByte
27000h
28000h USB /CS1
96K
Controller
30000h
/CS0 640K
40000h
512KByte
(256KByte
(256KByte
u
2Bank)
80000h 80000h
(00000h) (40000h)
512KByte
External
ROM
ROM
External
ROM
ROM
(256KByte
u
2Bank)
BFFFFh (3FFFFh) (7FFFFh)
C0000h
ROM
BANK=0
BANK=0
ROM
BANK=1
BANK=1
D0000h Internal ROM 192KByte
(D0000h-FFFFFh)
FFFFFh
Physical adress
are in parentheses.
are in parentheses.
PORT
PIN No.
I/O
PIN NAME
SIGNAL NAME
INTIAL VALUE
OFF MODE
FUNCTION
P00
111
I
P0_0/D0
D0
L
Out L
DATA BUS
P01
110
I
P0_1/D1
D1
L
Out L
DATA BUS
P02
109
I
P0_2/D2
D2
L
Out L
DATA BUS
P03
108
I
P0_3/D3
D3
L
Out L
DATA BUS
P04
107
I
P0_4/D4
D4
L
Out L
DATA BUS
P05
106
I
P0_5/D5
D5
L
Out L
DATA BUS
P06
105
I
P0_6/D6
D6
L
Out L
DATA BUS
P07
104
I
P0_7/D7
D7
L
Out L
DATA BUS
P10
103
O
P1_0/D8
I01
H
In
PRINTER MOTOR DRIVE
P11
102
O
P1_1/D9
I00
H
In
PRINTER MOTOR DRIVE
P12
101
O
P1_2/D10
PH02
L
Out L
PRINTER MOTOR DRIVE
P13
100
O
P1_3/D11
PH01
L
Out L
PRINTER MOTOR DRIVE
P14
99
O
P1_4/D12
PH12
L
Out L
PRINTER MOTOR DRIVE
P15
98
O
P1_5/D13/#INT3
PH11
L
Out L
PRINTER MOTOR DRIVE
P16
97
O
P1_6/D14/#INT4
I11
H
In
PRINTER MOTOR DRIVE
P17
96
O
P1_7/D15/#INT5
I10
H
In
PRINTER MOTOR DRIVE
P20
95
O
P2_0/A0
A0
H
Out L
ADDRESS BUS
P21
94
O
P2_1/A1
A1
H
Out L
ADDRESS BUS
P22
93
O
P2_2/A2
A2
H
Out L
ADDRESS BUS
P23
92
O
P2_3/A3
A3
H
Out L
ADDRESS BUS
P24
91
O
P2_4/A4
A4
H
Out L
ADDRESS BUS
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