ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 8

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

Preliminary Version 1.2
4. Pin Definition
RAiO
4-1
4-2
TECHNOLOGY INC.
DATA[7:0]
Pin Name
Pin Name
MPU Interface
Clock Interface
(ZRW)
BUSY
ZCS1
ZWR
ZRD
(EN)
CS2
INT
RS
XG
XD
I/O
I/O
O
O
I
I
I
I
I/O
O
I
Data Bus
These are data bus for data transfer between MPU and RA8806.
The high nibble DATA[7:4] is output and should keep floating when 4-bits
data bus mode is used.
Enable/Read Enable
When MPU interface(I/F) is 8080 series, this pin (ZRD) is used as data read,
active low.
When MPU I/F is 6800 series, this pin (EN) is used as Enable, active high.
Write/Read-Write
When MPU I/F is 8080 series, this pin (ZWR) is used as data write, active
low.
When MPU I/F is 6800 series, this pin(ZRW) is used as data read/write
control. Active high for read and active low for write.
Command / Data Select Input
The pin is used to select command/data cycle. RS = 0, data Read/Write
cycle is selected. RS = 1, status read/command write cycle is selected.
In 8080 interface, usually it connects to “A0” address pin.
Chip Select Input
The MPU interface of RA8806 is active only when ZCS1 is low and CS2 is
high.
Interrupt Signal Output
The interrupt output for MPU to indicate the status of RA8806. It could be
setup active high or low.
Busy Signal Output
This is a busy output to indicate the RA8806 is in busy state. It could be set
to active high or active low by register. The RA8806 can’t access MPU cycle
when BUSY pin is active.
It could be used for MPU to poll busy status by connecting it to I/O port.
X’tal Input
In internal clock mode, this pin connects to external X’tal(4M ~ 12MHz).
In external clock mode, it connects to external clock.
X’tal Output
This pin connects to external X’tal(4M ~ 12MHz). In external clock mode, it
keeps floating.
RS
8/184
0
0
1
1
Two Layers Character/Graphic LCD Controller
Description
Description
ZWR
0
1
0
1
Access Cycle
Status Read
Data Read
CMD Write
Data Write
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RA8806