ks0074 Samsung Semiconductor, Inc., ks0074 Datasheet - Page 43

• Manufacturer Part Number: ks0074
• Description: 34com/80seg Driver & Controller For Dot Matrix Lcd
• Manufacturer: Samsung Semiconductor, Inc.

KS0074
34COM/80SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD
INTERFACE WITH MPU
KS0074 can transfer data in bus mode (4-bit or 8-bit) or serial mode with MPU. Hence, both types of 4 or 8-bit MPU
can be used.
In case of 4-bit bus mode, data transfer is performed by twice to transfer 1 byte data.
(1) 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 lower 4-bit (in case
of 8-bit bus mode, the contents of DB0 - DB3) are transferred. So transfer is performed by twice. Busy Flag outputs "High"
after the second transfer is ended.
(2) When interfacing data length are 8-bit, transfer is performed at a time through 8 ports, from DB0 to DB7.
(3) If IM is set to "Low", serial transfer mode is set.