ST7789V2 datasheet(126/319 Pages) SITRONIX

126 / 319 page

ST7789V2

Version 1.0

Page 126 of 319

2016/11

Sitronix Confidential

The information contained herein is the exclusive property of Sitronix and shall not be distributed, reproduced, or

disclosed in whole or in part without prior written permission of Sitronix.

8.12 Address Control

The address counter sets the addresses of the display data RAM for writing and reading.

Data is written pixel-wise into the RAM matrix of DRIVER. The data for one pixel or two pixels is collected

(RGB 6-6-6-bit), according to the data formats. As soon as this pixel-data information is complete the “Write

access” is activated on the RAM. The locations of RAM are addressed by the address pointers. The address

ranges are X=0 to X=239 (Efh) and Y=0 to Y=319 (13Fh). Addresses outside these ranges are not allowed.

Before writing to the RAM, a window must be defined that will be written. The window is programmable via

the command registers XS, YS designating the start address and XE, YE designating the end address.

For example the whole display contents will be written, the window is defined by the following values:

XS=0 (0h) YS=0 (0h) and XE=239 (Efh), YE=319 (13Fh).

In vertical addressing mode (MV=1), the Y-address increments after each byte, after the last Y-address

(Y=YE), Y wraps around to YS and X increments to address the next column. In horizontal addressing mode

(V=0), the X-address increments after each byte, after the last X-address (X=XE), X wraps around to XS and

Y increments to address the next row. After the every last address (X=XE and Y=YE) the address pointers

wrap around to address (X=XS and Y=YS).

For flexibility in handling a wide variety of display architectures, the commands “CASET, RASET and

MADCTL”, define flags MX and MY, which allows mirroring of the X-address and Y-address. All combinations

of flags are allowed. Section 8.12 show the available combinations of writing to the display RAM. When MX,

MY and MV will be changed the data bust be rewritten to the display RAM.

For each image condition, the controls for the column and row counters apply as below

Condition

Column Counter

Row Counter

When RAMWR/RAMRD command is accepted

Return to

“Start Column (XS)”

Return to

“Start Row (YS)”

Complete Pixel Read / Write action

Increment by 1

No change

The Column counter value is larger than “End Column (XE)”

Return to

“Start Column (XS)”

Increment by 1

The Column counter value is larger than “End Column (XE)”

and the Row counter value is larger than “End Row (YE)”

Return to

“Start Column (XS)”

Return to

“Start Row (YS)”

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