S6A0074 Datasheet, PDF (41/68 Pages) Samsung semiconductor – 34COM/80SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD

34COM/80SEG DRIVER & CONTROLLER FOR DOT MATRIX LCD
S6A0074
INTERFACE WITH MPU
S6A0074 can transfer data in bus mode (4-bit or 8-bit) or serial mode with MPU. So you can use any type 4 or 8-
bit MPU.
In case of 4-bit bus mode, data transfer is performed by two times to transfer 1 byte data.
• When interfacing data length are 4-bit, only 4 ports, from DB4 - 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 two
times. Busy Flag outputs "High" after the second transfer are ended.
• When interfacing data length are 8-bit, transfer is performed at a time through 8 ports, from DB0 - DB7.
• If IM is set to "Low", serial transfer mode is set.
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