ST7571 datasheet(45/76 Pages) SITRONIX

45 / 76 page

ST7571

Ver 1.5a

45/76

2009/7/21

9.1.27 Extension Command Set1

This instruction enables the extension command set-1.

R/W

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

9.1.28 Extension Command Set2

This instruction enables the extension command set-2.

R/W

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

9.1.29 Extension Command Set3

This instruction enables the extension command set-3.

R/W

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Extension Command Set 1

After entering the extension mode-1, the extension command set-1 is enabled. These commands are valid only in this

mode. Always remember to return back to normal mode for correct operation.

Increase Vop Offset

This instruction increases the Vop offset (Vof[4:0]) by 1.

R/W

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Decrease Vop Offset

This instruction decreases the Vop offset (Vof[4:0]) by 1.

R/W

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Fine Tune Vop

The

“Increase Vop Offset” and “Decrease Vop Offset” instructions fine tune the voltage of Vop. The relation is shown below:

Note:

The range is limited. If continuously setting

“Increase Vop Offset”, Vof[4:0] will increase. When Vof[4:0] is 0x0F and

followed by a

“Increase Vop Offset” command, Vof[4:0] will become 0x10. As the result, Vop changes from +15 step

to -16 step. Software programmer should add a software protection to prevent that an operator maybe presses the

“Increase Button” too many times accidentally.

”[5:0] = EV[5:0] + Vof[4:0] and EV”[5:0] ≤ 0x3F. If EV[5:0] + Vof[4:0] > 0x3F, EV”[5:0] will truncate the invalid bit.

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