S1C62N33 TECHNICAL SOFTWARE
EPSON
II-47
CHAPTER 5: PERIPHERAL CIRCUITS (LCD Driver)
LCD Driver
The S1C62N33 Series has four common pins and 40
segment pins, so that it can drive an LCD with up to 160 (40
× 4) segments.
The driving method is 1/4 duty (or 1/3 duty with the mask
option) dynamic drive.
Further, the S1C62N33 Series provides software setting of
the LCD static drive.
5.5
Segment data mem-
ory map
Fig. 5.5.1
Segment data memory map
Address
Page
High
Low
01
234
567
89
A
B
C
D
E
F
4 or C
5 or D
6 or E
Segment data memory (40 words x 4 bits)
40H–6FH = R/W
C0H–EFH = W
0
The LCD segments are lit or turned off depending on this
data.
When "1" is written:
Lit
When "0" is written:
Not lit
Read-out:
Available for 40H–6FH
Undefined for C0H–EFH
At initial reset, the contents of the segment data memory are
undefined.
- When 40H–6FH is selected for the segment data memory, the
memory data and the display will not match until the area is
initialized (through, for instance, memory clear processing by the
CPU). Initialize the segment data memory by executing initial
processing.
- When C0H–EFH is selected for the segment data memory, that
area becomes write-only. Consequently, data cannot be rewrit-
ten by arithmetic operations (such as AND, OR, ADD, SUB).
- Data output from segment pins selected as DC output will be the
data corresponding to the COM0 pins.
Segment data memory
(40H–6FH or C0H–EFH)
Note