RA8816N
Preliminary Version 1.0
144x65 Character/Graphic LCD Driver
4. Pin Definition
4-1 MPU Interface
Table 4-1
Pin Name
I/O
Description
Data Bus
When MPU uses parallel mode and 8-bit interface then all of the DB[7:0] are
valid. When uses 4-bit interface then only DB[3:0] are valid, and DB[7:4]
have to be kept floating.
When P/S is “0”, then the interface between MPU and RA8816N is Serial
Mode. The pins DB[7:6] (SMOD[1:0]) are used to select which serial mode:
SMOD :
0 : Reserved.
Serial Mode
DB[7:0]
0
DB0: SCK
DB1: SDA/SDO
DB2: RS/SDI
0
1 : 3-Wire, SCK, SDA, CS are used.
0 : 4-Wire, SCK, SDA, RS, CS are used.
1 : 4-Wire, SCK, SDO, SDI, CS are used.
I/O
1
1
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.
Read Control or Enable
RD
EN
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 be kept high for 3 or 4-wires serial mode.
I
I
Write Control or Read-Write Control
When use 8080 series interface, WR is the write signal and active low.
WR
When use 6800 series interface, this pin is R/ W , active high for read cycle
and active low for write cycle.
R/ W
This pin must be kept high for 3 or 4-wires serial mode.
Data/Command Select or Register Select
When use 8080 series interface, this is Data or Command signal. When
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 be kept high for serial mode.
Chip Select
D/ C
RS
I
I
This is chip enable for RA8816N.
This pin must be kept high for serial mode.
CS
Interrupt Signal
This is an interrupt output for MPU. Active low。
O
INT
MPU Select
C86 = 0 Î The MPU interface is 8080 series.
C86 = 1 Î The MPU interface is 6800 series (Default).
This pin must be kept high for serial mode.
C86
I
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