RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 === === === === === === === === === === 0 0 0 0 0 0 0 1 I/D S
Sets the cursor move direction and specifies or not to shift the display. These operations are performed during data read and write.
Details
I/D: Increments (I/D = 1) or Decrements (I/D = 0) the DD RAM address by 1
when a character code is written into or read from the DD RAM.
The cursor or blink moves to the right when incremented by 1
and to the left when decremented by 1.
The same applies to writing to and reading from the CG RAM.
S: Shifts the entire display either to the right or to the left when S is 1; to the left when I/D = 1 and to the right when I/D = 0. Thus it looks as if the cursor stands still and the display moves.