Chapter 4. Hardware Description; Block Diagram; Memory Map - Sharp XE-A302 Service Manual

CHAPTER 4. HARDWARE DESCRIPTION

1. BLOCK DIAGRAM

XE-A302U
VH (8V)
VLED (5.7V)
VCC
VDD
VDRW (+23.8V)
VLMP (4.3V)
12MHz CPU
32.768kHz
RAM 10k BYTE
DRIVER, SENSOR
HIN
211
PRINTER
RS-232
CH1
CH2
CPU
MITSUBISHI M30620SAFP
(INTERNAL RAM 10KB)
EXTERNAL MEMORY
SRAM 512KB
FLASH ROM 512KB
SHARP LH28F004BVT
PRINTER
M-T53II
RS-232
1ch
Battery
Ni-MH
BZ
DRAWER1
BR0~2
GAL
/CS0
/CS1,/CS2
A0~19
D0~7
FROM
SRAM1
SRAM2 EPROM
HC375
FRONT
HC
2Line
HC245
138
LCD
HC374
HIN
HC245
211
DIG DRV
SEG DRV
4 to 16
/S0 9
Pop up Decoder
LCD
KR0 KR7
HC245
KR0 KR11
XE-A302U HARDWARE DESCRIPTION

2. MEMORY MAP

2-1. ADDRESS MAP
Bank 0 Bank 1
0 1
BR0
0 0
BR1
BR2 0 0
00000h
00400h
02C00h
04000h
08000h
External SRAM 1 32KB External SRAM 1
28000h
30000h
40000h
External SRAM 1 Flash ROM
(CG Data)
60000h
256KB
(Reserve)
80000h IPL SW
F-ROM
OFF:F-ROM Not used
(Program)
ON:EP-ROM
(512KB)
C0000h
(Program)
(512KB)
FFFFFh
Even if the bank is changed, the
same address can be accssed.
Pop
up
7deg
LED
KEY
&
2-2. EXTERNAL BUS
SW
External BUS ACCESS SPEED
SRAM/EPROM/FLASH ROM ; 2 BCLK
External I/O ; 2 BCLK *1BCLK = 83.3ns (at 12MHz)
SRAM /CS2 area:
/CS1 area BANK 0, 2:
/CS0 area BANK 0:
Reserve /CS0 area BANK 4, 5: address 40000h ~ 7FFFFh 256KB x 2
FLASH /CS0 area BANK 0
ROM
Reserve /CS0 area BANK 6:
I/O /CS3 area BANK 0:
– 5 –
Bank 2 Bank 3 Bank 4 Bank 5 Bank 6
0 1 0 1 0
1 1 0 0 1
0 0 1 1 1
SFR area
Internal RAM area 10KB
Internal reserved area
External I/O
External SRAM 1
128KB
32KB External SRAM 1 32KB External SRAM 1
(Phantom) (Phantom)
External SRAM 1 64KB
External External External
Flash ROM
SRAM 2 SRAM 2 SRAM 2
256KB
(CG Data) 256KB 256KB
(Phantom)
(Reserve) (Reserve)
(Reserve)
Not used
512KB 512KB
Flash ROM
Program 256KB
Not used bank 4, 5 and bank 6, 7
Caution: The printer handler and so on should be
stored to C0000h or later.
address 08000h ~ 27FFFh 128KB
address 28000h ~ 2FFFFh 32KB x 2
address 30000h ~ 3FFFFh 64KB
address 40000h ~ 7FFFFh 256KB
address 80000h ~ FFFFFh 256KB
(Moves to Bank 1 when
rewritten using EPROM)
address 80000h ~ FFFFFh 256KB
address 04000h ~ 07FFFh 16KB
Bank 7
1
1
1
CS3
/CS2
32KB /CS1
/RAMCS1
External
/CS0
SRAM 2
/RAMCS2
256KB
(Phantom)