
LCD Controller-Driver
S-4561A
34
Seiko Instruments Inc.
Examples of Smooth Scroll of 2nd Lines of a 5-Dot 2-Line x 12-Column Display
9.
Icon Only Display
Regardless of the contents of the display data RAM (DDRAM), the icon only is displayed and the LCD panel is compelled to
be off. Since the contents of the DDRAM do not change, the state is returned to the original display by canceling the Icon
Only Display mode. While the icon only is being displayed, the LCD panel is driven at low power consumption. This allows
for the reduction in the boosting level and also the reduction in the current consumption. Four levels of booster drive
frequency can be selected by the lower 2 bits of the ICON ONLY DISPLAY command (refer to Instruction Explanation: page
18). The booster drive frequency differs depending upon the size of the LCD panel and wiring capacity. Determine the
appropriate frequency on the actual LCD panel.
10. Power Save
After inputting the POWER SAVE command, the CR oscillating circuit and the LCD power supply circuit stop, and the
current consumption of the IC goes down nearly to the value during standstill simultaneously with display OFF. This is valid
for reducing the current consumption when the display is not needed or during wait.
The DDRAM and instruction state still remains unchanged and is returned to the original display by canceling the Power
Save.
11. Connection to LCD
Common output terminals are mounted on both right and left of the chip.
Common wiring is needed with respect to the
panel configuration and also display columns.
0
RS
0
R/WX
0
DB7
0
DB6
1
DB5
1
DB4
0
DB3
1
DB2
0
DB1
-
DB0
q
Extended Instruction Select
q
2nd Line Select
0
1
0
1
-
1
0
q
1 dot shifts left
0
1
0
1
-
0
1
q
2 dots shift left
0
1
0
1
-
0
1
0
q
3 dots shift left
0
1
0
1
-
0
1
q
4 dots shift left
0
1
0
1
-
1
0
q
5 dots shift left
0
1
0
1
-
1
0
1
q
1 character shifts left
(6 dots shift left)
0
1
0
1
0
1
q
1 dot shifts left
(7 dots shift left)
0
1
0
1
-
0
1
q
2 dots shift left
(8 dots shift left)
0
1
0
1
-
0
1
0
q
15 characters shift left
(90 dots shift left)
0
1
0
1
0
1
q
5 dots shift left
(95 dots shift left)
0
1
0
1
-
1
0
1
q
No character shifts
(Original Display Position)
0
1
0
1
0
Remarks
R After Dot Shift, set a wait time for the next shift so as to make the display legible.
R To execute the Smooth Scroll, shift characters left by the amount corresponding to the display column
(including non-displayed characters) and input the instruction so that the amount of the shift is reduced.