SED1521 datasheet(26/52 Pages) ETC

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4.7 – 4.9

4.0 Commands

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371-1.0

4.7

READ DISPLAY DATA

This command allows the MPU to read 8 bits of data from the display data RAM location specified

by a column address and a page address. Once the data is read, the column address is automat-

ically incremented by 1; this enables the MPU to read multi-word data continuously.

A dummy read is needed immediately after the column address is set. For details, see 3. (1)–(c).

4.8

SELECT ADC

This command inverts the relation of assignment between display data RAM column addresses

and segment driver outputs. In other words, the Select ADC command can software-invert the or-

der of segment driver output pins, reducing the restrictions on the configuration of ICs at LCD mod-

ule assembly. For details, see Fig. 2.3.8.1.

Incrementing the column address by 1, which takes place after the MPU writing or reading display

data, follows the sequence of column addresses specified in Fig. 2.3.8.1.

D = 0:

Clockwise output (forward)

D = 1:

Counterclockwise output (reverse)

4.9

STATIC DRIVE ON/OFF

This command forces all display to be on and, at the same time, all common output to be selected.

D = 0:

Static drive off

D = 1:

Static drive on

R/W

RD WR D7

Read data

RD WR D7

0101010000

R/W

RD WR D7

0101010010

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