em65100 ELAN Microelectronics Corp, em65100 Datasheet - Page 13

• Manufacturer Part Number: em65100
• Description: 69 Com/ 101 Seg 4 Gray Level Stn Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

6.3 System Bus Pins
* This specification is subject to be changed without notice.
D1/SDA
D0/SCL
(R/WB)
Symbol
D2-D7
RESB
TEST
WRB
RDB
CSB
M86
(E)
P/S
RS
I/O
I/O
I
I
I
I
I
I
I
I
Reset input pin.
When RESB is “L”, initialization is executed.
Data bus / Signal interface related pins.
When parallel interface is selected (P/S = “H”), The D7-D0 are 8-bits bi-directional data bus,
connect to MPU data bus.
When 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
SDA data is latched at the rising edge of SCL.
Internal serial/parallel conversion into 8-bit data occurs at the rising edge of 8
After completing data transferring, or when making no access, be sure to set SCL to “L”.
Chip Select input pin.
CSB = “L”: accepts access from MPU
CSB = “H”: denies access from MPU
RAM/Register select input pin.
RS = “0”: D7-D0 are display RAM data
RS = “1”: D7-D0 are 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”: The data on D7-D0 are latched at falling edge of the E signal.
Read/Write control pin
Select 80-family MPU type (M86 = “L”)
The WRB is a data write signal. The data on D7-D0 are latched at rising edge of the WRB
signal.
Select 68-family MPU type (M86 = “H”)
Read/Write control input pin.
R/W = “H”: Read
R/W = “L”: Write
MPU interface type selecting input pin.
M86 = “H”: 68-family interface
M86 = “L”: 80-family interface
Fixed at either “H” or “L”
Parallel/Serial interface select pin.
P/S = “H”: For parallel interface.
P/S = “L”: For serial interface. Fix D15-D5 pins are Hi-Z, RDB and WRB pins to either “H”
or “L”.
For testing. Fix to “L”.
P/S Chip select
H
L
CSB
CSB
Data identification
69 COM/ 101 SEG 4 Gray Level STN LCD Driver
RS
RS
Description
D0-D7 RDB, WRB
Data
SDA
Read/Write
Write only
2005/3/8 (V0.6)
Serial clock
SCL
-
th
clock of SCL
EM65100
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