ks0070b Samsung Semiconductor, Inc., ks0070b Datasheet - Page 23

• Manufacturer Part Number: ks0070b
• Description: 16com / 80seg Driver & Controller For Dot Matrix Lcd
• Manufacturer: Samsung Semiconductor, Inc.

KS0070B
INTERFACE WITH MPU
1) Interface with 8-bit MPU
When interfacing data length are 8-bit, transfer is performed all at once through 8 ports, from DB0 to DB7.
An Example of the timing sequence is shown below.
2) Interface with 4-bit MPU
When interfacing data length are 4-bit, only 4 ports, from DB4 to DB7, are used as data bus.
At first, higher 4-bit (in case of 8-bit bus mode, the contents of DB4 - DB7) are transferred, and then the lower 4-bit
(in case of 8-bit bus mode, the contents of DB0 - DB3) are transferred. So transfer is performed in two parts. Busy
Flag outputs “1” after the second transfer are ended.
Example of timing sequence is shown below.
Internal
signal
RS
R/W
DB7
E
Internal
signal
RS
R/W
DB7
E
INSTRUCTION
INSTRUCTIO N
D7
DATA
Fig-4. Example of 8-bit Bus Mode Timing Diagram
Fig-5. Example of 4-bit Bus Mode Timing Diagram
D3
16COM / 80SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD
Busy Flag Check
Internal operation
Internal operation
Busy
Busy Flag Check
Busy
AC3
Busy Flag Check
Busy
Busy Flag Check
Busy
No
Busy Flag Check
No Busy
AC3
D7
INSTRUCTIO N
INSTRUCTION
DATA
D3