em65570sagh ELAN Microelectronics Corp, em65570sagh Datasheet - Page 21

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

Product Specification (V1.0) 04.18.2006
(This specification is subject to change without further notice)
D3/SMODE
D4/SPOL
DUMMY
Symbol
D1/SDA
D0/SCL
D8-D15
(R/WB)
D5-D7
RESB
TEST
WRB
CSB
RDB
M86
CSL
P/S
RS
D2
(E)
6.3 System Bus Pins
I/O
I/O
I/O
I
I
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
SMODE: Serial transfer mode select pin
SPOL: RS pole select pin when 3-wires serial interface is selected.
SDA data is latched at the rising edge of SCL.
Internal serial/parallel conversion into 8-bit data occurs at the rising edge of 8th clock of SCL
After completing data transferring, or when making no access, be sure to set SCL to “L”.
Useless pins (D7~D0) must be fixed to “H” or “L” on serial transfer mode.
8-bit bi-directional bus. Connected to MPU data bus.
Used as data bus for upper 8-pins in the 16-bits access mode.
Useless pins (D15~D8) must be fixed to “H” or “L” on 8-bits access mode.
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”
For testing. Fix to “L”.
“Floating”
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”.
Common output mode selecting input pin.
CSL = “H”: COM0, COM2, COM4, … , COM66 & COM1, COM3, COM5, … , COM67
CSL = “L”: COM0, COM1, COM2, … , COM65, COM66, COM67
P/S
H
L
Chip select
CSB
CSB
Data identification
RS
RS
Description
68COM/98SEG 65K Color STN LCD Drivers
D0-D7
Data
SDA
Read/Write
RDB, WRB
Write only
Serial clock
EM65570S
SCL
-
x 15