SSD1821 datasheet(18/43 Pages) ETC1

18 / 43 page

SSD1820A/21

REV 1.4

01/03

SOLOMON

COMMAND TABLE

Hex

Command

Comment

00~0F

Set Lower Column Address

Sets the lower nibble of the column address pointer for

RAM access. The pointer is reset to 0 after reset.

10~17

Set Upper Column Address

Sets the upper nibble of the column address pointer for

RAM access. The pointer is reset to 0 after reset.

18~1F

Reserved

20~27

Set Internal Regulator Resis-

tor Ratio

The internal regulator gain (1+R2/R1)Vcon increases as

R2R1R0 is increased from 000b to 111b. The resistor

ratio (1+R2/R1) is given by:

R2R1R0 = 000: 2.3 (POR)

R2R1R0 = 001: 3.0

R2R1R0 = 010: 3.7

R2R1R0 = 011: 4.4

R2R1R0 = 100: 5.1

R2R1R0 = 101: 5.8

R2R1R0 = 110: 6.5

R2R1R0 = 111: 7.2

28~2F

VC VR

VF Set Power Control Register

VC=0: turns OFF the internal voltage booster (POR)

VC=1: turns ON the internal voltage booster

VR=0: turns OFF the internal regulator (POR)

VR=1: turns ON the internal regulator

VF=0: turns OFF the output op-amp buffer (POR)

VF=1: turns ON the output op-amp buffer

30~3F

Reserved

40~43

Set Display Start Line

The next command specifies the row address pointer

(0-63) of the RAM data to be displayed in COM0. This

command has no effect on COMS. The pointer is set to

0 after reset.

44~47

Set Display Offset

The next command specifies the mapping of first display

line (COM0) to one of ROW0~63. This command has no

effect on COMS. COM0 is mapped to ROW0 after reset.

48~4B

Set Multiplex Ratio

The next command specifies the number of lines,

excluding COMS, to be displayed. With Icon is disabled

(POR), duties 1/16~1/64 or 1/80 could be selected. With

Icon enabled, the available duty ratios are 1/17~ 1/65 or

1/81.

4C~4F

Set N-line Inversion

The next command sets the n-line inversion register

from 3 to 33 lines to reduce display crosstalk. Register

values from 00001b to 11111b are mapped to 3 lines to

33 lines respectively. Value 00000b disables the N-line

inversion, which is the POR value.

To avoid a fix polarity at some lines, it should be noted

that the total number of mux (including the icon line)

should NOT be a multiple of the lines of inversion (n).

50~57

Set LCD Bias

Sets the LCD bias from 1/4 ~ 1/10 according to

B2B1B0:

000: 1/4 bias

001: 1/5 bias

010: 1/6 bias

011: 1/7bias

100: 1/8 bias

101: 1/9 bias (POR for SSD1820A)

110: 1/9 bias (for SSD1820A)

1/10 bias (POR for SSD1821)

111: 1/9 bias (for SSD1820A); 1/10 bias (for SSD1821)

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