EM65101
128COM/160SEG 16 Gray Scale Level LCD Driver
6.3 System Bus Pins
Symbol
I/O
Description
Reset input pin.
When RESB is “L,” initialization is executed.
RESB
I
Data bus/ Signal interface related pins.
When the parallel interface is selected (P/S = “H”), the D7-D0 are 8-bit
bi-directional data bus connecting to the MPU data bus.
When the serial interface is selected (P/S = “L”), D0 and D1 (SCL, SDA) are used
as serial interface pins.
SCL: Input pin for data transfer clock
SDA: Serial data input pin
SMODE: Serial transfer mode select pin
SPOL: RS pole select pin when the 3-wire serial interface is selected.
SDA data is latched at the rising edge of SCL.
D0/SCL
D1/SDA
D2
D3/SMODE
D4.SPOL
D5-D7
I/O
Internal serial/parallel conversion into 8-bit data occurs at the rising edge of the 8th
clock of SCL. After data transfer is complete or when making no access, you must
set SCL to “L.”
Chip select input pin
CSB
RS
I
I
CSB = “L”: accepts access from MPU
CSB = “H”: denies access from MPU
RAM/Register select input pin
RS = “0”: D7-D0 to display RAM data
RS = “1”: D7-D0 to control register data
Read/Write control pin
Select 80-family MPU type (M86 = “L”)
The RDB is a data read signal. When RDB is “L”, D7-D0 are in an output status.
Select 68-family MPU type (M86 = “H”)
R/WB = “H”: When E is “H,” D7-D0 are in an output status.
R/WB = “L”: Data on D7-D0 are latched at the falling edge for the E signal.
RDB
(E)
I
I
Read/Write control pin
Select 80-family MPU type (M86 = “L”)
The WRB is a data write signal. Data on D7-D0 are latched at the rising edge of the
WRB signal.
Select 68-family MPU type (M86 = “H”)
Read/Write control input pin.
R/W = “H”: Read
WRB
(R/WB)
R/W = “L”: Write
MPU interface type select input pin.
M86 = “H”: 68-family interface
M86 = “L”: 80-family interface
Fixed at either “H” or “L”
M86
I
I
TEST
For testing. Fix to “L.”
Parallel/Serial interface select pin
P/S Chip Select Data Identification Data Read/Write Serial Clock
H
L
CSB
CSB
RS
RS
D0-D7 RDB, WRB
SDA Write only
-
SCL
P/S
I
P/S = “H”: For parallel interface
P/S = “L”: For serial interface. Fixed D15-D5 pins are Hi-Z, RDB and WRB pins to
either “H” or “L.”
Product Specification (V0.4) 08.15.2005
• 11
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
