HM17CM256 datasheet(20/111 Pages) HYNIX

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HM17CM256

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(7) Window address assign of display RAM

This IC can be accessed to display RAM by window area designation in addition to access to

display RAM designated by X and Y address.

Through address space of all display address, specific area of RAM can be accessed by

designated two points.

The start point of two point addresses is assigned by normal X address and Y address register and

the end point of them is done by X end address and Y end address register value.

Designated

inner addresses depend on WLS bit.

Read modified write action can be taken by AIM=“1”.

In case of using window area accessing mode, you must set start point X address, Y address in

sequence and end point X address, Y address in sequence after executing Win command (WIN=“1”,

auto increase mode AXI=“1”, AYI=“1”) and then access to Display RAM.

And set start point and end point not to be designated to access the outside of available address

area.

Address set value should be taken to set AX

≤ EX ( end point of X address ) and AY≤EY

( end point of Y address ).

X direction

(X, Y)

address designation

end address designation

Window display area

(X, Y)

All display RAM area

(8) display RAM data and LCD

Display RAM data related with one dot of LCD is dependent on REV register.

Normal display and

reverse display by REV register are set up as follows.

TABLE

REV

Display

RAM data

normal

reverse

(9)

Segment display output order/reverse set up

The order of display outputs, SEGA0, SEGB0, SEGC0 to SEGA127, SEGB127, and can be reversed

by reversing access to display RAM from MPU by using REF register, lessen the limitation in placing

IC when assembling an LCD panel module.

HM17CM256 Datasheet(PDF) 20 Page - Hynix Semiconductor

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