RA8825 Ver la hoja de datos (PDF) - RAIO
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RA8825 Datasheet PDF : 6 Pages
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Preliminary Version 1.1
RA8825
128x33 Graphic LCD Driver
5-1 MPU Interface
Pin Name
6. Pin Definition
I/O
Description
Data Bus
When the MPU use parallel mode and 8-bit then all of the DB[7:0] are
valid. When use 4-bit then only DB[4:0] are valid, and DB[7:4] have to
keep floating.
When P/ S is “0”, then the interface between MPU and RA8825 is Serial
Mode. The pins DB[7:6](SMOD[1:0]) are used to select which serial mode:
DB[7..0]
SMOD :
Serial Mode
-----------------------------------------------------------------
DB0: SCK
0 X : 3-Wire, SCK, SDA, are used.
DB1: SDA/SDO I/O
DB2: RS/SDI
1 0 : 4-Wire, SCK, SDA, RS, are used.
1 1 : 4-Wire, SCK, SDO, SDI, CS are used.
DB3: CS
DB[7:6]: SMOD
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
I When use 8080 series interface, is the read signal and active low.
EN
When use 6800 series interface, EN is the Enable signal and active high.
Connect this pin to VDD for serial mode.
Write Control or Read-Write Control
When use 8080 series interface, is the write signal and active low.
R/
I When use 6800 series interface, this pin is R/ , active high for read
cycle and active low for write cycle.
Connect this pin to VDD for serial mode.
Data/Command Select or Register Select)
When use 8080 series interface, this is Data or Command signal. When
D/
RS
D/ C is “0”, means Register Cycle(or Command Cycle). When D/ C is
I “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.
Connect this pin to VDD for serial mode.
Chip Select
CS
I This is a chip enable for RA8825.
Connect this pin to VDD for serial mode.
Interrupt Signal
O This is an interrupt output for MPU. Active low。
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