RA8806
Preliminary Version 1.0
Two Layers Character/Graphic LCD Controller
6. Function Description
6-1 MPU Interface
6-1-1 MPU Type
The RA8806 support 8080 or 6800 compatible MPU interface. When the pin “MI” is pull low then the
MPU interface is set to 8080 compatible. If “MI” pulls high then the MPU interface is defined as 6800
compatible. And the pin “DB” is used to select the 8080 MPU data bus is 4-bits or 8-bits. When “DB”
is pulled low, then the data bus for data transition is 4-bits. If pin “DB” pull high, the data transition is
8-bits. The option of 4-bits or 8-bits data bus is for both 8080 and 6800 MPU. Of course, if used 4-
bits interface then the 8080 MPU has to take double time to communicate with RA8806.
8080
RA8806
MPU
A0
A1-A7
IORQ
RS
ZCS1
CS2
Decoder
MI
D0-D3(D0 -D7)
DATA0-3(DATA0-7)
RD
WR
ZRD
ZWR
ZRST
RES
Figure 6-1 : 8080 (4/8-bits) MPU Interface
6800
RA8806
MPU
VDD
A0
A1-A7
VMA
RS
ZCS1
CS2
Decoder
MI
D0-3(D0-D7)
EN
DATA0-3(DATA0-7)
EN
R/W
ZRW
ZRST
RES
Figure 6-2 : 6800 (4/8-bits) MPU Interface
RAiO TECHNOLOGY INC.
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RAIO [ RAIO TECHNOLOGY INC. ]
