SSD1811 View Datasheet(PDF) - Solomon Systech

Part Name

Description

Manufacturer

SSD1811

LCD Segment / Common Driver with Controller

Solomon Systech  

Set Read-Modify-Write Mode

This command puts the chip in read-modify-write mode in

which:

1. column address is saved before entering the mode

2. column address is increased only after display data write

but not after display data read.

This Ready-Modify-Write mode is used to save the MCU’s

loading when a very portion of display area is being updated fre-

quently.

As reading the data will not change the column address, it

could be get back from the chip and do some operation in the

MCU. Then the updated data could be write back to the GD-

DRAM with automatic address increment.

After updating the area, “Set End of Read-Modify-Write

Mode” is sent to restore the column address and ready for next

update sequence.

Software Reset

Issuing this command causes some of the chip’s internal

status registers to be initialized:

• Read-Modify-Write mode is exited

• Static indicator is turned OFF

• Display start line register is cleared to 0

• Column address counter is cleared to 0

• Page address is cleared to 0

• Normal scan direction of the COM outputs

• Internal regulator resistors Ratio is set to 4

• Contrast control register is set to 20h

Set End of Read-Modify-Write Mode

This command relieves the chip from read-modify-write

mode. The column address before entering read-modify-write

mode will be restored no matter how much modification during

the read-modify-write mode.

Set Indicator On/Off

This command turns on or off the static indicator driven by

the M and MSTAT pins.

When the “Set Indicator On” command is sent, the second

command byte “Indicator Display Mode” must be followed. How-

ever, the “Set Indicator Off” command is a single byte command

and no second byte command is required.

The status of static indicator also controls whether standby

mode or sleep mode will be entered, after issuing the power

save compound command. See “Set Power Save Mode” later in

this section.

NOP

A command causing the chip takes No OPeration.

Set Test Mode

This command force the driver chip into its test mode for in-

ternal testing of the chip. Under normal operation, users should

NOT apply this command.

Set Power Save Mode

Entering Standby or Sleep Mode should be done by using a

compound command composed of “Set Display ON/OFF” and

“Set Entire Display ON/OFF” commands. When “Set Entire Dis-

play ON” is issued when display is OFF, either Standby Mode or

Sleep Mode will be entered.

The status of the Static Indicator will determine which power

save mode is entered. If static indicator is off, the Sleep Mode

will be entered:

• Internal oscillator and LCD power supply circuits

are stopped

• Segment and Common drivers output VDD level

• The display data and operation mode before

sleep are held

• Internal display RAM can still be accessed

If the static indicator is on, the chip enters Standby Mode

which is similar to sleep mode except addition with:

• Internal oscillator is on

• Static drive system is on

Please also be noted that during Standby Mode, if the soft-

ware reset command is issued, Sleep Mode will be entered. Both

power save modes can be exited by the issue of a new software

command or by pulling Low at hardware pin RES .

Status register Read

This command is issued by pulling D/C Low during a data

read (refer to Figure 11 on page 27 and Figure 12 on page 28 for

parallel interface waveforms). It allows the MCU to monitor the

internal status of the chip.

No status read is provided for serial mode.

EXTENDED COMMANDS

These commands are used, in addition to basic commands,

to trigger the enhanced features designed for the chip.

Set Multiplex Ratio

This command switches default multiplex ratio to any multi-

plex mode from 2 to the maximum multiplex ratio (POR value),

including the icon line. Max. mux ratio:

SSD1811: 49

SSD1812: 55

SSD1813: 33

SSD1815: 65

The chip pins ROW0-ROW63 will be switched to corre-

sponding COM signal output, see Table 8 on page 22 for exam-

ples of 18 multiplex (including icon line) settings without and with

7 lines display offset for different SSD181X members.

It should be noted that after changing the display multiplex

ratio, the bias ratio may also need to be adjusted to make display

contrast consistent.

SSD181X Series

21

Rev 3.1

08/2001

SOLOMON

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