Epson SED 1520 Series Техническое руководство - Страница 26

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Epson SED 1520 Series Техническое руководство

Read Display Data

R/W

Reads 8-bits of data from the data I/O latch, updates the contents of the I/O latch with display data from the display data

RAM location specified by the contents of the column address and page address registers and then increments the column

address register.

After loading a new address into the column address register one dummy read is required before valid data is obtained.

Select ADC

R/W

This command selects the relationship between display data RAM column addresses and segment drivers.

D=1: SEG0

column address 4FH, ... (inverted)

D=0: SEG0

column address 00H, ... (normal)

This command is provided to reduce restrictions on the placement of driver ICs and routing of traces during printed circuit

board design. See Figure 2 for a table of segments and column addresses for the two values of D.

Static Drive ON/OFF

R/W

Forces display on and all common outputs to be selected.

D=1: Static drive on

D=0: Static drive off

Select Duty

R/W

This command sets the duty cycle of the LCD drive and is only valid for the SED1520F and SED1522F. It is invalid for

the SED1521F which performs passive operation. The duty cycle of the SED1521F is determined by the externally

generated FR signal.

SED1520

D=1:

1/32 duty cycle

D=0:

1/16 duty cycle

When using the SED1520F

as follows:

SED1522

1/16 duty cycle

1/8 duty cycle

, SED1522F

(having a built-in oscillator) and the SED1521F

SED1520F

SED1522F

EPSON

Read data

SED1521F

1/32

1/16

1/32

1/8

1/16

SED1520 Series

A0H, A1H

A4H, A5H

A8H, A9H

continuously, set the duty

2–17