LH155BA datasheet(33/51 Pages) SHARP

33 / 51 page

LH155BA

4.11. Increment Control Register Set

* mark means "Don't care".

(At the time of reset : (AIM, AYI, AXI) = 0H, read address : AH)

The increment mode is set up when accessing the

graphic display RAM.

(The graphic display RAM only)

By AIM, AYI, and AXI registers, the setting-up of

increment operation/non-operation for the X-

address counter and the Y-address counter every

write access or every read access to the graphic

display RAM is possible.

In setting to this control register, the increment

operation of address can be made without setting

successive addresses for writing data or for reading

data to the graphic display RAM from MPU.

After setting this register, be sure to set the X and

Y address registers.

Because it is not assuring the data of X and Y

address registers after setting increment control

registers, the increment control of X and Y

addresses by AIM, AYI and AXI registers is as

follows.

q This is effective when subsequently writing and reading the successive address areas.

w This is effective in the case that, after reading and writing the successive address areas for every address,

the read data are modified to write.

AIM

SELECTION OF INCREMENT TIMING

REFERENCE

When writing to graphic display RAM or reading from graphic display RAM

Only when writing to graphic display RAM (read modify)

CSB

RDB

WRB

1010

AIM

AYI

AXI

LH155BA Datasheet(PDF) 33 Page - Sharp Corporation