SOLOMON
SSD1820A/21
23
REV 1.4
01/03
Set Contrast Control Register
This command adjusts the contrast of the LCD panel by
changing VL6 of the LCD drive voltage provided by the On-Chip
power circuits. VL6 is set with 64 steps (6-bit) contrast control
register. It is a compound commands:
Set Display Offset
The next command specifies the mapping of display start line
(COM0 if display start line register equals to 0) to one of ROW0-
63/79. This command has no effect on COMS. COM0 is mapped
to ROW0 after reset.
Set Multiplex Ratio
This command switches default 64 multiplex mode to any mul-
tiplex from 16 to 64/80, if Icon is disabled (POR). When Icon is set
enable, the corresponding multiplex ratio setting will be mapped
to 17 to 65/81. The chip pads ROW0-ROW63/ROW79 will be
switched to corresponding COM signal output as specified in Ta-
ble 1 or 2.
Set Power Save Mode
To force the chip to enter Sleep Mode.
Exit Power Save Mode
This command releases the chip from Sleep Mode and return
to normal operation.
Set N-line Inversion
Number of line inversion is set by this command for reducing
crosstalk noise. 3 to 33-line inversion operations could be
selected. At POR, this operation is disabled.
It should be noted that the total number of mux (including the
icon line) should NOT be a multiple of the inversion number (n).
Or else, some lines will not change their polarity during frame
change.
Exit N-line Inverstion
This command releases the chip from N-line inversion mode.
The driving waveform will be inverted once per frame after issu-
ing this command.
Set DC-DC Converter Factor
Internal DC-DC converter factor is set by this command. For
SSD1820A, 2X to 5X multiplying factors could be selected. For
SSD1821, 2X to 6X mutiplying factors could be selected. 2X/3X,
4X, 5X and 6X factors are selected uising this command. Hard-
ware configuration is used for 2X or 3X setup.
Set Icon Enable
Set Contrast Control Register
Contrast Level Data
Changes
Complete?
No
Yes
This command enable/disable the Icon display.
Start InternalOscillator
After POR, the internal oscillator is OFF. It should be
turned ON by sending this command to the chip.
Set Display Data Length
This two-byte command only valid when 3-wire SPI config-
uration is set by H/W input (PS0=PS1=L). The second 8-bit is
used to indicate that a specified number display data byte (1-
256) are to be transmitted. Next byte after the display data
string is handled as a command.
Set Test Mode
This command force the driver chip into its test mode for
internal testing of the chip. Under normal operation, user
should NOT use this command.
Status register Read
This command is issued by setting D/C Low during a data
read (refer to figure 1 and 2 parallel interface waveform). It al-
lows the MCU to monitor the internal status of the chip. No sta-
tus read is provided for serial mode.
EXTENDED COMMANDS
These commands are used, in addition to basic commands, to
enable the enhanced features designed in the chips.
Set Temperature Coefficient (TC) Value
This command is to set 1 out of 2 different temperature
coefficients in order to match various liquid crystal tempera-
ture grades.
Enable external oscillator input.
This command enables the external clock input from CL
pin.
Select Oscillator Source
This command is used to adjust the oscillator frequency
to desire frame frequency.
Set Interface Lock / Unlock
After the interface lock command is issued, no more data or
commands will be accepted until an interface unlock com-
mand is issued.
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