ks0078 Samsung Semiconductor, Inc., ks0078 Datasheet - Page 16

• Manufacturer Part Number: ks0078
• Description: 34com/120seg Driver & Controller For Dot Matrix Lcd
• Manufacturer: Samsung Semiconductor, Inc.

KS0078
34COM/120SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD
Timing Generation Circuit
Timing generation circuit generates clock signals for the internal operations.
Address Counter (AC)
Address Counter(AC) stores DDRAM/CGRAM/SEGRAM address, transferred from IR.
After writing into (reading from) DDRAM/CGRAM/SEGRAM, AC is automatically increased
(decreased) by 1. When RS = "Low" and R/W = "High", AC can be read through DB0~DB6
Cursor/Blink Control Circuit
It controls cursor/blink ON/OFF and black/white inversion at cursor position.
LCD Driver Circuit
LCD Driver circuit has 34 common and 120 segment signals for LCD driving.
Data from SEGRAM/CGRAM/CGROM is transferred to 120-bit segment latch serially, which is stored to 120-bit shift latch.
When each common is selected by 34-bit common register, segment data also output through segment driver from 100-bit segment
latch.
In 1-line display mode, COM0 ~ COM17 have 1/17 duty, and in 2-line or 4-line mode, COM0 ~ COM33 have 1/33 duty
ratio.