Specifications

S1C62N82 TECHNICAL HARDWARE EPSON I-45
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
LCD Driver
In the S1C62N82 Series, when selecting 1/8 duty, there are
8 common terminals (COM0–COM7) and 38 segment termi-
nals (SEG0–SEG37) available which allow up to 304 (i.e., 38
× 8) LCD segments to be driven. During selection of 1/4
duty, there are 4 common terminals (COM0–COM3) and 42
segment terminals (SEG0–SEG41) available which allow up
to 168 (i.e., 42 × 4) LCD segments to be driven.
1/8 duty and 1/4 duty may be selected by mask option.
Because the power for LCD driving is produced through the
internal circuit of the CPU, there is no particular need to
externally supply it.
Driving method is 1/8 duty dynamic driving through VDD,
VL1, VL2, VL3 and VL4 (or VDD, VL1, VL2 and VL3 if 1/4 duty
were selected). The frame frequency is 32 Hz (fosc1 =
32,768 Hz) for both 1/8 and 1/4 duties. Figure 4.6.1 shows
the drive waveform for 1/4 duty, and Figure 4.6.2 shows the
drive waveform for 1/8 duty.
fosc1 indicates the oscillation frequency of the oscillation circuit.
In case 1/4 duty was selected with the mask option, set CD and
VL4 to N.C. (not connected). (Refer to Chapter 5, "BASIC EXTER-
NAL WIRING DIAGRAM".)
Configuration of LCD
driver
4.6
Note