SSD1815 datasheet(18/35 Pages) ETC

18 / 35 page

SSD1815

REV 1.5

03/2000

SOLOMON

entered after the power save compound command. See “Set

Power Save Mode”.

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

Display Mode”must be followed in the next command. The “Set

Indicator Off” command is a single byte command and no fol-

lowing command is required.

NOP

A command causing No Operation.

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.

Set Power Save Mode

To enter Standby or Sleep Mode, it 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:

1. Internal oscillator and LCD power supply circuits are

stopped

2. Segment and Common drivers output VDD level

3. The display data and operation mode before sleep are

held

4. 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:

1. Internal oscillator is on

2. Static drive system is on

Note also that if the software reset command is issued during

Standby Mode, 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 9 and 10 for parallel interface waveforms). It al-

lows 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, on top of general ones, designed

for the chip.

Set Multiplex Ratio

This command switches default 64 multiplex mode to any

multiplex mode from 2 to 64. The chip pads ROW0-ROW63 will

be switched to corresponding COM signal output, see Table 1

for examples of different multiplex settings.

Set Bias Ratio

Except the 1/4 bias, all the available bias ratios (1/5, 1/6, 1/7,

1/8 and 1/9) could be set using this command plus the Set LCD

Bias. When changing the display multiplex ratio, the bias ratio

also need to be adjusted to make display contrast consistent.

Set Temperature Coefficient (TC) Value

4 different temperature coefficient settings is selected by this

command in order to match various liquid crystal temperature

grades.

Modify Oscillator Frequency

The oscillator frequncy can be fine tuned by applying this com-

mand. Since the oscillator frequency will be affected by some

other factors, this command is not recommended for general

usage. Please contact our application engineer for more detail

explaination on this command.

Set 1/4 Bias Ratio

This command sets the bias ratio directly to 1/4 bias. This ratio

is especially for use in under 12mux display.

In order to restore to other bias ratio, this command must be

executed, with LSB=0, before the “Set Multiplex ratio” or “Set

LCD Bias”command is sent.

Set Total Frame Phases

The total number of phases for one display frame is set by this

command.

The Static Icon is generated by the overlapping of the M and

MSTAT signals. To turn on the Static Icon, 3 phases overlapping

will be applied to these signals, while 1 phase overlapping will be

given to the Off status.

The more the total number of phasesin one frame, the less the

overlapping time and thus the lower the effective driving voltage

at the Static Icon on the LCD panel.

Set Display Offset

This command should be sent ONLY when the multiplex ratio

is set less than 64.

When the mulitplex ratio less than 64 is set, the display will be

mapped in the middle (y-direction) of the LCD, see Table 1. Use

this command could move the display vertically within the 64 com-

mons.

To make the Reduced-Mux Com 0 (Com 0 after reducing the

multiplex ratio) towards the Row 0 direction for L lines, the 6-bit

data in second command should be given by L.

To move in the other direction by L lines, the 6-bit data should

be given by 64-L.

Please note that the display is confined within the un-reduced

64 mux. That is maximum value of L is given by the half of 64 mi-

nus the reduced-multiplex ratio. For an odd display mux after re-

duction, moving away from Row 0 direction will has 1 more step.

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