S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 284
S1D1
Manufacturer Part Number
S1D1
Description
LCD Controller-driver With Built-in Character ROM
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D1.pdf
(612 pages)
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The Display Data Latch Circuit
The display data latch circuit is a latch that temporarily
stores the display data that is output to the liquid crystal
driver circuit from the display data RAM.
Because the display normal/reverse status, display ON/
OFF status, and display all points ON/OFF commands
control only the data within the latch, they do not change
the data within the display data RAM itself.
The Oscillator Circuit
This is a CR-type oscillator that produces the display
clock. The oscillator circuit is only enabled when M/S
= HIGH and CLS = HIGH.
When CLS = LOW the oscillation stops, and the display
clock is input through the CL terminal.
Two-frame alternating current drive wave form (S1D15605
Rev. 2.4a
COM0
COM1
DATA
SEGn
RAM
FR
CL
64
65 1
2
3
4
5
6
EPSON
Figure 5
60 61 62 63 64 65 1
Display Timing Generator Circuit
The display timing generator circuit generates the timing
signal to the line address circuit and the display data
latch circuit using the display clock. The display data is
latched into the display data latch circuit synchronized
with the display clock, and is output to the data driver
output terminal. Reading to the display data liquid
crystal driver circuits is completely independent of
accesses to the display data RAM by the MPU.
Consequently, even if the display data RAM is accessed
asynchronously during liquid crystal display, there is
absolutely no adverse effect (such as flickering) on the
display.
Moreover, the display timing generator circuit generates
the common timing and the liquid crystal alternating
current signal (FR) from the display clock. It generates
a drive wave form using a 2 frame alternating current
drive method, as is shown in Figure 5, for the liquid
crystal drive circuit.
*****
)
2
3
4
S1D15605 Series
5
6
V
V
V
V
V
V
V
V
V
V
V
V
DD
1
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DD
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5
DD
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8–29
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