ST7920 - Topwaydisplay.com

ST7920Description of basic instruction set• CLEARRSRWDB7DB6DB5DB4DB3DB2DB1DB0Code0000000001Fill DDRAM with "20H"(space code). And set DDRAM address counter (AC)to"00H". Set entry mode I/D bit to be "1".Cursor moves right and AC adds 1 after write or read operation.• HOMERSRWDB7DB6DB5DB4DB3DB2DB1DB0Code000000001xSet DDRAM address counter(AC)to "00H". Cursor moves to origin. Then content of DDRAM is not changed.• ENTRY MODE SETRSRWDB7DB6DB5DB4DB3DB2DB1 DB0Code00000001I/DSSet the cursor movement and display shift direction when doing write or read operation.I/D :address counter increase / decreaseWhen I/D = "1", cursor moves right, DRAM address counter(AC)add by 1.When I/D = "0", cursor moves left, DRAM address counter(AC)subtract by 1.S: Display shiftS I/D DESCRIPTIONH H Entire display shift left by 1H L Entire display shift right by 1V3.1 19/42 2003/04/11