ra8803 RAIO Technology Inc., ra8803 Datasheet - Page 27

• Manufacturer Part Number: ra8803
• Description: Two Layers Character/graphic Lcd Controller Specification
• Manufacturer: RAIO Technology Inc.

Version 2.5
6. Function Description
RAiO
6-1 MPU Interface
TECHNOLOGY INC.
The RA8803/8822 support 8080 or 6800 compatible MPU interface. When the pin SYS_MI is pull low
then the MPU interface is set to 8080 compatible. If SYS_MI pull high then the MPU interface is defined
as 6800 compatible.
And the pin SYS_DB is used to select the 8080 MPU data bus is 4-Bit or 8-Bit. When SYS_DB pull low,
then the data bus for data transition is 4-Bit. If pin SYS_DB pull high, the data transition is 8-Bit. The
option of 4-Bit or 8-Bit data bus is for 8080 MPU only. Of course, if used 4-Bit interface then the 8080
MPU has to take double time to communicate with RA8803/8822.
Figure 6-2: 6800 (8-Bit Only) MPU Interface
8080
MPU
D0-D3(D0 -D7)
6800
MPU
Figure 6-1: 8080 (4/8-Bit) MPU Interface
D0-D7
A1-A7
A1 -A7
IORQ
VMA
RES
RES
R/W
WR
RD
EN
A0
A0
Decoder
Decoder
27/48
Two Layers Character/Graphical LCD Controller
RS
CS1
CS2
DB0-3(DB0-7)
RD
WR
RST
RS
CS1
CS2
DB0-7
EN
R/W
RST
RA8803/8822
RA8803/8822
-
SYS_MI
SYS_MI
VDD
RA8803/8822
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