ST7920 datasheet(21/49 Pages) SITRONIX

21 / 49 page

ST7920

V4.0

21/49

2008/08/18

Function Set

DL: 4/8-bit interface control bit

When DL = "1", 8-bit MPU bus interface

When DL = "0", 4-bit MPU bus interface

RE: extended instruction set control bit

When RE = "1", extended instruction set

When RE = "0", basic instruction set

In same instruction cannot alter DL and RE at once. Make sure that change DL first then RE.

Set CGRAM Address

Set CGRAM address into address counter (AC)

AC range is 00H

…3FH

Make sure that in extended instruction SR=0 (scroll address or RAM address select)

Set DDRAM Address

Set DDRAM address into address counter (AC).

First line AC range is 80H

…8FH

Second line AC range is 90H

…9FH

Third line AC range is A0H

…AFH

Fourth line AC range is B0H

…BFH

Please note that only 2 lines can be display with one ST7920.

Read Busy Flag (BF) and Address

Read busy flag (BF) can check whether the internal operation is finished or not. At the same time, the value of

address counter (AC) is also read. When BF =

“1”, further instruction(s) will not be accepted until BF = “0”.

Code

RW DB7 DB6 DB5 DB4

DB1

DB2

DB3

DB0

AC6 AC5 AC4 AC3 AC2

Code

DB7

DB6

DB5

DB4

DB1

DB2

DB3

AC1 AC0

DB0

AC5 AC4 AC3 AC2

Code

DB7

DB6

DB5

DB4

DB1

DB2

DB3

AC1 AC0

DB0

AC6 AC5 AC4 AC3 AC2

Code

DB7

DB6

DB5

DB4

DB1

DB2

DB3

AC1 AC0

DB0

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