Specifications

S1C6S2N7 TECHNICAL HARDWARE EPSON I-41
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
Switching between
dynamic and static
drive
The S1C6S2N7 Series allows software setting of the LCD
static drive. This function enables easy adjustment (ca-
dence adjustment) of the oscillation frequency of the OSC
circuit.
The procedure for executing of the LCD static drive is as
follows:
➀ Write 1 to the CSDC register at address 0FBH D3.
➁ Write the same value to all registers corresponding to
COMs 0 through 3 of the display memory.
- Even when l/3 duty is selected, the display data corresponding
to COM3 is valid for static drive. Hence, for static drive, set the
same value to all display memory corresponding to COMs 0
through 3.
- For cadence adjustment, set the display data corresponding to
COMs 0 through 3 , so that all the LCD segments go on.
Figure 4.6.7 shows the drive waveform for static drive.
Note
SEG
0–25
COM
0–3
Frame frequency
LCD lighting status
COM0
COM1
COM2
COM3
SEG0–25
-V
DD
-V L1
-V L2
-V L3
-V DD
-V L1
-V L2
-V L3
-V DD
-V L1
-V L2
-V L3
Not lit
Lit
Fig. 4.6.7
LCD static drive waveform