ST7577 datasheet(26/48 Pages) SITRONIX

26 / 48 page

ST7577

Ver 1.0a

26/48

2008/02/14

H=0

When Function Set instruction sets H=0, the selected instruction descriptions are as below.

End Read-Modify-Write

This command releases the Read-Modify-Write mode, and returns the column and row address to the address it was at

when the mode was entered.

R/W(/WR)

Enable Read-Modify-Write

This command is used paired with the

”End Read-Modify-Write” instruction. Once this command has been input, the display

data read command does not change the column and row address, but only the display data write command increments (+1)

the address depend on V register setting. This mode is maintained until the END command is input. When the END

command is input, the address returns to the address it was at when the read/modify/write command was entered. This

function makes it possible to reduce the load on the MPU when there are repeating data changes in a specified display

region, such as when there is a blanking cursor.

R/W(/WR)

* Even in read/modify/write mode, other commands aside from display data read/write commands can also be used.

Yes

Read-Modify-Write

Done

Page Address Set

Column Address Set

Finished?

Dummy Read

Read-Modify-Write Cycle

Data Read

Modify Data

Data Write (at same Address)

Display Control

The bits D and E configure the display mode.

R/W(/WR)

Flag

Description

D, E

Display Mode

Display Blank (DDRAM Data is masked out, segments

will always output non-selected waveform)

All Segments ON

Normal mode

Inverse Display mode

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