ML9044 datasheet(16/55 Pages) OKI

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ML9044

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Address Counter (ADC)

The address counter provides a read/write address for the DDRAM, ABRAM or CGRAM and

also provides a cursor display address.

When an instruction code specifying DDRAM, ABRAM or CGRAM address setting is input to

the pre–defined register, the register selects the specified DDRAM, ABRAM or CGRAM and

transfers the address code to the ADC. The address data in the ADC is automatically incremented

(or decremented) by 1 after the display data is written in or read from the DDRAM, ABRAM or

CGRAM.

The data in the ADC is output to DB0 to DB6 when R/W = “H”, RS0 = “L”, RS1 = “H” and BF =

“0”.

Timing Generator

The timing generator generates timing signals for the internal operation of the ML9044 activated

by the instruction sent from the CPU or for the operation of the internal circuits of the ML9041

such as DDRAM, ABRAM, CGRAM and CGROM. Timing signals are generated so that the

internal operation carried out for LCD displaying will not be interfered by the internal operation

initiated by accessing from the CPU. For example, when the CPU writes data in the DDRAM,

the display of the LCD not corresponding to the written data is not affected.

ML9044 Datasheet(PDF) 16 Page - OKI electronic componets