em65570sagh ELAN Microelectronics Corp, em65570sagh Datasheet - Page 24

• Manufacturer Part Number: em65570sagh
• Description: 68com/98seg 65k Color Stn Lcd Drivers
• Manufacturer: ELAN Microelectronics Corp

EM65570S
68COM/98SEG 65K Color STN LCD Drivers
18 x
7.1.5 Serial Interface
EM65570S has two types serial interface, namely, 3-wire type serial interface; and
4-wire type serial interface
SMODE = “L”: 4-wires serial interface
SMODE = “H”: 3-wires serial interface
7.1.6 4-wire Serial Interface
When chip select is active (CSB = “L”), 4-wires type serial interface can work through
the SDA and SCL input pins
register and counter are reset in the initial condition
sequentially in order of D7 to D0 at the rising of serial clock (SCL) and are converted
into 8-bit parallel data (by serial to parallel conversion) at the rising edge of the 8th
serial clock, being processed in accordance with the data
are serial data inputs (SDA) are display data or control register data is judged by input
to RS pin.
RS = “L”: display RAM data
RS = “H”: control register data
After completing 8-bit data transfer, or when making no access, be sure to set serial
clock input (SCL) to “L”
be taken in board writing
select (CSB = “H”) every completion of 8-bit data transferring.
7.1.7 3-wire Type Serial Interface
When chip select is active (CSB = “L”), 3-wires type serial interface can work through
the SDA and SCL input pins
register and counter are reset in the initial condition
sequentially in order of RS, D7 to D0 at the rising edge of serial clock (SCL) and are
converter into 9-bit parallel data (by serial to parallel conversion) at the rising edge of
the 9
CSB
SDA
SCL
RS
th
serial clock
.
1
D7
.
.
Cares of SDA and SCL signals against external noise should
Figure 7-1 4-wire Type Serial Interface
D6
, both are
To prevent transfer error due to external noise, release chip
2
.
.
When chip select is inactive (CSB = “H”), the internal shift
When chip select is inactive (CSB = “H”), the internal shift
D5
3
determined by the SMODE pin.
(This specification is subject to change without further notice)
D4
4
D3
5
Product Specification (V1.0) 04.18.2006
.
.
Serial data SDA are input
Serial data SDA are input
D2
6
.
The identification whether
7
D1
D0
8