Read Sharp XE-A301 (serv.man3) Service Manual online
XE-A301V
HARDWARE DESCRIPTION
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CHAPTER 4. HARDWARE DESCRIPTION
1. BLOCK DIAGRAM
XE-A301
CPU
MITSUBISHI M30620SAFP
(INTERNAL RAM 10KB)
EXTERNAL MEMORY
RAM
256KB
FLASH ROM
512KB
SHARP LH28F004BVT
PRINTER
PR45M
II
KEY BOARD
Normal key type: 58 keys
Drawer/Coin case
SK-420 (5B/8C)
2. MEMORY MAP
2-1. ADDRESS MAP
Only the /CS0 area (30000h ~ FFFFFh) in the bank is valid.
2-2. EXTERNAL BUS
256KB
PRINTER
CPU
RAM 10KB
4 to 16
DECODER
RS232C
KEY & SW
POWER
SUPPLY
DRAWER
KEY SCAN
DIG DRIVER
SEG
KEY RETURN
RAM
POPUP
7 DIGITS
LCD
16DIGITS x 2line
DRIVER, SENSOR
External BUS ACCESS SPEED
SRAM/EPROM/FLASH ROM ; 2 BCLK
External I/O ; 2 BCLK
*
1BCLK = 83.3ns (at 12MHz)
SRAM
/CS2 area
address 08000h ~ 27FFFh 128KB
/CS0 area BANK 0
address 30000h ~ 4FFFFh 128KB
FLASH ROM
/CS0 area BANK 0
address 80000h ~ FFFFFh 256KB
(Moves to Bank 1 when rewritten using EPROM)
I/O
04000h ~ 07FFFh
28000h ~ 2FFFFh (Reserved)
BANK 0
BANK 1
BANK 2
BANK 3
/CS0
0
0
0
0
BR0
0
1
0
1
BR1
0
0
1
1
00000h
00400h
02C00h
04000h
/CS3
08000h
/CS2
28000h
/CS 1
30000h
40000h
50000h
/CS 0
80000h
IPL SW
IPL SW
OFF:Flash ROM
OFF:EP ROM
ON:
ROM
ON: Flash ROM
C0000h
FLASH ROM
Lower 256KB
FFFFFh
Even if the bank is changed, the same address
can be accessed.
Internal rserved area
External I/O
External SRAM
1
External I/O
(Cutter)
Internal RAM
area
10KB
128KB
External SRAM2
64KB
External SRAM2
64KB
Reserved
Reserved
EP
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