ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 27

• Manufacturer Part Number: ra8806
• Description: Two Layers Character/graphic Lcd Controller
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.2
6. Function Description
RAiO
6-1
TECHNOLOGY INC.
6-1-1 MPU Type
MPU Interface
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. In order to
reduce the transmission line interference between MPU interface and RA8806, we suggest that a
small capacitor to the GND should be added at the signal of ZCS1、ZRD、ZWR, please see the
following Figure 6-1.
D0-D3(D0 -D7)
6800
6800
MPU
MPU
8080
MPU
Figure 6-1 : 8080 (4/8-bits) MPU Interface
Figure 6-2 : 6800 (4/8-bits) MPU Interface
D0-3(D0-D7)
D0-3(D0-D7)
A1-A7
A1-A7
A1-A7
IORQ
VMA
VMA
RES
RES
RES
R/W
R/W
WR
EN
EN
RD
A0
A0
A0
Decoder
Decoder
Decoder
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Two Layers Character/Graphic LCD Controller
RS
ZCS1
CS2
DATA0-3(DATA0-7)
ZRD
ZWR
ZRST
RS
RS
ZCS1
ZCS1
CS2
CS2
DATA0-3(DATA0-7)
DATA0-3(DATA0-7)
EN
EN
ZRW
ZRW
ZRST
ZRST
RA8806
RA8806
RA8806
MI
MI
MI
VDD
VDD
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RA8806