HD66710 Datasheet, PDF (35/73 Pages) Hitachi Semiconductor – (Dot Matrix Liquid Crystal Display Controller/Driver)

HD66710
i) 5-dot character width ii) 6-dot character width
Figure 14 Character Width Control
Cursor or Display Shift
Cursor or display shift shifts the cursor position or display to the right or left without writing or reading
display data (Table 8). This function is used to correct or search the display. In a 2-line display, the
cursor moves to the second line when it passes the 40th digit of the first line. In a 4-line display, the
cursor moves to the second line when it passes the 20th character of the line. Note that, all line displays
will shift at the same time. When the displayed data is shifted repeatedly each line moves only
horizontally. The second line display does not shift into the first line position.
These instruction reset the extended register enable bit (RE) to 0 in function set.
The address counter (AC) contents will not change if the only action performed is a display shift.
In low power mode (LP = 1), whole-display shift cannot be normally performed.
Function Set
Only when the extended register enable bit (RE) is 1, the BE bit shown below can be accessed. Bits DL
and N can be accessed regardless of RE.
DL: Sets the interface data length. Data is sent or received in 8-bit lengths (DB7 to DB0) when DL is 1,
and in 4-bit lengths (DB7 to DB4) when DL is 0.
When 4-bit length is selected, data must be sent or received twice.
Table 8 Shift Function
S/C R/L
0
0
Shifts the cursor position to the left. (AC is decremented by one.)
0
1
Shifts the cursor position to the right. (AC is incremented by one.)
1
0
Shifts the entire display to the left. The cursor follows the display shift.
1
1
Shifts the entire display to the right. The cursor follows the display shift.
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