Xe-A40S; Chapter 4. Hardware Description; Block Diagram; Memory Map - Sharp XE-A40S Service Manual

XE-A40S

CHAPTER 4.
XE-A40S
HARDWARE DESCRIPTION

[1] BLOCK DIAGRAM

POWER
SUPPLY
CPU
RAM 10KB
DRIVER, SENSOR
PRINTER
M66291GP
CPU
M30620SAFP (MITSUBISHI, internal RAM 10KB)
External memory
RAM 256KB
FLASH ROM 512KB
SHARP LH28F004BVT
PRINTER PR45M II
USB controller RENESAS M66291GP
DRAWER
FLASH ROM
512KB
SRAM
256KB
LCD
16 digits x 2
SEG DRIVER
POPUP
7 digits
DIG DRIVER
4 to 16
DECODER
KEY & SW
KEY SCAN
KEY RETURN
USB
Service Manual

[2] MEMORY MAP

1. ADDRESS MAP
BANK 0
/CS0 0
BA0 0
00000h
00400h
02C00h
04000h
08000h
28000h
30000h
40000h
50000h
80000h
IPL MODE
OFF: Flash ROM
ON: EP ROM
C0000h
FFFFFh
Only the BANK in /CS area(30000h-FFFFFh) is effective.
2. EXTERNAL BUS
External BUS Access Speed
*1BCLK=83.3ns (at 12MHz)
SRAM /CS2 Area
/CS0 Area BANK0
FLASH /CS0 Area BANK0
ROM
*Moves to Bank 1 when rewritten using EPROM

[3] PRINTER CONTROL

1. STEPPING MOTOR CONTROL
The stepping motor is driven at a constant voltage by Sanken
STA471A.
1step: 0.125mm, A1dot: 1step
Printing speed 50mm/s
1.1. CPU's PORT
No. CPU PORT
80 P10
79 P11
78 P12
77 P13
76 P14
75 P15
74 P16
73 P17
4 – 1
BANK 1
0
1
Internal RAM area
10KB
Internal rserved area
External I/O
External SRAM 1
128KB
External I/O
(USB controller)
External SRAM 2
128KB
External reserved area
IPL MODE
OFF: EP ROM
ON: Flash RPM
SRAM: 2BCLK
EPROM: 2BCLK
FLASH ROM: 2BCLK
External I/O: 2BCLK
address 08000h~27FFFh 128KB
address 30000h~4FFFFh 128KB
address 80000h~FFFFFh 512KB
Signal to be used
RAS
RBS
RCS
RDS
JAS
JBS
JCS
JDS
/CS3
/CS2
/CS1
/CS0