Service manual

ER-A410U/ER-A420U HARDWARE DESCRIPTION
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CHAPTER 4. HARDWARE DESCRIPTION
1. BLOCK DIAGRAM
ER-A410 and ER-A420
2. MEMORY MAP
2-1. ADDRESS MAP
Only the /CS0, /CS1 area (28000h~FFFFFh) in the bank is valid.
2-2. EXTERNAL BUS
CPU
MITSUBISHI M30620SAFP 12MHz
(INTERNAL RAM 10KB)
EXTERNAL MEMORY
RAM 512KB
FLASH ROM 512KB
SHARP LH28F004BVT
PRINTER
PR45MII
POWER
SUPPLY
CPU
RAM 10KB
DRAWER 1
DRAWER 2
RAM
512KB 1MB
DRIVER, SENSOR
PRINTER
EFT I/F BOARD
(option)
MUX
RS232C CH1
RS232C CH2
KEY & SW
KEY SCAN
KEY RETURN
4 to 16
DECODER
SEG DRIVER
DIG DRIVER
LCD
16 DIGITS
x 2 LINES
POPUP
7-DIGIT
LED
EXTERNAL BUS ACCSESS SPEED
SRAM/EPROM/FLASH ROM; 2 BCLK
EXTERNAL I/O; 2 BCLK
*1BCLK = 83.3ns (at 12MHz)
SRAM /CS2 area
address 08000h~27FFFh 128KB
/CS1 area BANK 0,2
address 28000h~2FFFFh 32KB x 2
/CS0 area BANK 0
address 30000h~7FFFFh 320KB
FLASH ROM /CS0 area BANK 0
address 80000h~FFFFFh 258KB
(Moves to Bank 1 when rewriting using EPROM.)
Internal RAM area
10KB
External SRAM 4
64KB
External SRAM 5
256KB
CG ROM
512KB
(Lower level)
FLASH ROM
Lower 256KB
FLASH ROM
Lower 256KB
IPL SW
OFF: Flash ROM
ON: EP ROM
IPL SW
OFF: EP ROM
ON: Flash RPM
CG ROM
512KB
(Upper level)
External SRAM 2
32KB
External SRAM 3
32KB
External SRAM 1
128KB
Internal reserved area
External I/O
Even if the bank is changed, the same
address can be accessed.
00400h
00000h
BR1
BR0
/CS0
0
0
0
BANK 0
0
1
0
BANK 1
1
0
0
BANK 2
1
1
0
BANK 3
02C00h
04000h
08000h
28000h
30000h
40000h
50000h
80000h
C0000h
FFFFFh
/CS3
/CS2
/CS1
/CS0