Sharp XE-A402

PC-UM10M
XE-A402 HARDWARE DESCRIPTION
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CHAPTER 4. HARDWARE DESCRIPTION
1. BLOCK DIAGRAM
XE-A401
CPU
MITSUBISHI M30620SAFP
(INTERNAL RAM 10KB)
EXTERNAL MEMORY
RAM 256KB
FLASH ROM 512KB
SHARP LH28F004BVT
CGROM 1MB (for Japanese market only)
PRINTER
PR45M
2. MEMORY MAP
2-1. ADDRESS MAP
Only the /CS0 area (30000h ~ FFFFFh) in the bank is valid.
2-2. EXTERNAL BUS
*
CGROM is available only for the Japanese market.
256KB
1MB
PRINTER
CPU
RAM 10KB
4 to 16
D
ECODER
RS232C
KEY & SW
POWER
SUPPLY
DRAWER
DIG DRIVER
SEG
KEY RETURN
RAM CGROM
POPUP
7 DIGITS
LCD
16 DIGITS
DRIVER, SENSOR
External BUS ACCESS SPEED
SRAM/EPROM/FLASH ROM ; 2 BCLK
CGROM ; 3 BCLK
External I/O ; 1 BCLK
*
1BCLK = 83.3ns (at 12MHz)
SRAM /CS2 area
address 08000h ~ 27FFFh 128KB
Same as ER-A235P
/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)
CGROM /CS0 area BANK 2, 3
address 40000h ~ BFFFFh (512KB x 2)
I/O
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
External SRAM 2 External SRAM 2 External SRAM 2 External SRAM 2
40000h 128KB 128KB 64KB 64KB
CG ROM CG ROM
50000h 512KB 512KB /CS 0
(Lower leve) (Upper level)
80000h
IPL SW IPL SW
OFF:Flash ROM OFF: EP ROM
ON:EP RPM ON: Flash RPM
C0000h
FLASH ROM FLASH ROM
256KB 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