RA8815
Preliminary Version 2.1
128x33 Character/Graphic LCD Driver
SMOD :
Serial Mode
-----------------------------------------------------------------
0 X : 3-Wire, SCK, SDA,
CS
are used.
1 0 : 4-Wire, SCK, SDA, RS,
CS
are used.
1 1 : 4-Wire, SCK, SDO, SDI,
CS
are used.
In serial mode, all of the related signals are defined by DB[3:0]:
SCK(DB0) : Serial Clock.
SDA(DB1) : Bi-direction Mode Serial Data.
SDO(DB1) : Data Out.
RS(DB2) : Memory/Register Cycle Select.
SDI(DB2) : Serial Data In.
CS
(DB3) : Chip Select, active low.
The unused pin must keep NC for serial mode.
Read Control or Enable
RD
EN
I
When use 8080 series interface,
RD
is the read signal and active low.
When use 6800 series interface, EN is the Enable signal and active high.
This pin must keep NC for serial mode.
Write Control or Read-Write Control
When use 8080 series interface,
WR
is the write signal and active low.
When use 6800 series interface, this pin is R/
W
, active high for read
cycle and active low for write cycle.
This pin must keep NC for serial mode.
Data/Command Select or Register Select)
When use 8080 series interface, this is Data or Command signal. When
WR
R/
W
I
D/
C
RS
I
CS
I
D/
C
is “0”, means Register Cycle(or Command Cycle). When D/
C
is
“1”, means Data Access Cycle(Data Cycle).
When use 6800 series interface, this is the RS signal. When RS is “0”,
means Register Cycle and “1” means Data Access Cycle.
This pin must keep NC for serial mode.
Chip Select
This is a chip enable for RA8815.
This pin must keep NC for serial mode.
Interrupt Signal
This is an interrupt output for MPU. Active low。
MPU Select
C86 = 0
The MPU interface is 8080 series.
C86 = 1
The MPU interface is 6800 series(Default).
This pin must keep NC for serial mode.
Data Bit Select
BIT4 = 0 The parallel mode is use 8-bit data bus.
BIT4 = 1 The parallel mode is use 4-bit data bus(Default).
This pin must keep NC for serial mode.
INT
O
C86
I
BIT4
I
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RAIO [ RAIO TECHNOLOGY INC. ]
