ST7637 datasheet(33/210 Pages) SITRONIX

33 / 210 page

ST7637

Ver 1.6

33/210

2009/03

7.4.2.

Address Control

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

Data is written pixel into the RAM matrix of ST7637. The data for one pixel or two pixels is collected (RGB 5-6-5-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=131 (83h) and Y=0

to Y=131 (83h). Addresses outside these ranges are not allowed.

Before writing to the RAM, a window must be defined into which 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=131 (83h), YE=131 (83h).

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 (MV=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 “MADCTR”, define flags

MV, MX and MY, which allows mirroring of the X-address and Y-address. All combinations of flags are allowed. Figure

7.4-1show the available combinations of writing to the display RAM. When MX, MY and MV will be changed the data must

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 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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