Specifications

II-30 EPSON S1C6S2N7 TECHNICAL SOFTWARE
CHAPTER 3: PERIPHERAL CIRCUITS (LCD Driver)
The S1C6S2N7 contains 128 bits of display memory in
addresses 090H to 0AFH of the data memory. Each display
memory can be assigned to any 104 bits of the 128 bits for
the LCD driver (26 SEG × 4 COM) or 78 bits of the 128 bits
(26 SEG × 3 COM) by using a mask option. The remaining
24 bits or 50 bits of display memory are not connected to
the LCD driver, and are not output even when data is writ-
ten. An LCD segment is on with "1" set in the display mem-
ory, and off with "0" set in the display memory. Note that the
display memory is a write-only.
• LCD drive control register (CSDC)
The LCD drive control register (CSDC: address 0FBH, D3)
can set either for dynamic drive or for static drive. Set "0" in
CSDC for 1/3 duty or 1/4 duty (time-shared) dynamic drive.
Set "1" in CSDC and the same value in the registers
corresponding to COM0 to COM2 (1/3) or COM0 to COM3
(1/4) for static drive.
Figure 3.5.2 shows the static drive control of the LCD, and
Figure 3.5.3 shows an example of the 7-segment LCD
assignment.
Control of the LCD
driver