Specifications

S1C6S2N7 TECHNICAL HARDWARE EPSON I-35
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
LCD Driver (COM0–COM3, SEG0–SEG25)
The S1C6S2N7 Series has four common pins and 26 (SEG0–
SEG25) segment pins, so that an LCD with a maximum of
104 (26 × 4) segments can be driven. The power for driving
the LCD is generated by the CPU internal circuit, so there is
no need to supply power externally.
The driving method is 1/4 duty (or 1/3, 1/2 duty are
selectable by mask option) dynamic drive, adopting the four
types of potential (1/3 bias), VDD, VL1, VL2 and VL3.
Moreover, the 1/2 bias dynamic drive that uses three types
of potential, VDD, VL1 = VL2 and VL3, can be selected by
setting the mask option.
The frame frequency is 32 Hz for 1/4 duty and 1/2 duty,
and 42.7 Hz for 1/3 duty (in the case of fosc = 32.768 kHz).
Figures 4.6.1–4.6.6 show the drive waveform for 1/4 duty
(1/3 bias), 1/3 duty (1/3 bias), 1/2 duty (1/3 bias), 1/4
duty (1/2 bias), 1/3 duty (1/2 bias) and 1/2 duty (1/2 bias),
respectively.
fosc indicates the oscillation frequency of the oscillation circuit.
Configuration of LCD
driver
4.6
Note