2010-04-13

12

SCDQ5541P/Q/R, SCDQ5542P/Q/R, SCDQ5543P/Q/R, SCDQ5544P/Q/R

SCDQ554XX Interface to Siemens/Intel 8031 Microprocessor (using serial port in mode 0)

SCDQ554XX Interface to Siemens/Intel 8031 Microprocessor (using one bit of parallel port as serial input)

Microprocessor Interface

The microprocessor interface is through the serial port, SPI port or one out of eight data bits on the eight bit parallel port and also control

lines SDCLK and LOAD.

Power Up Sequence

Upon power up display will come on at random. Thus the display should be reset at power-up. The reset will set the Address Register to

Digit 0, User RAM is set to 0 (display blank) the Control Word is set to 0 (100% brightness with Lamp Test off) and the internal counters

are reset.

SCDQ554XX Interface with Motorola 68HC05C4 Microprocessor (using SPI port)

IDCD5022

CC

V

RxD

TxD

P3.3

8031

XTAL

RST

CC

V

SCDQ554XX

SDATA

SDCLK

LOAD

2

3

1

CC

V

0.01 µF

+

20 µF

4

5

IDCD5023

CC

V

P0.0

P3.6

P3.0

8031

XTAL

RST

CC

V

SCDQ554XX

SDATA

SDCLK

LOAD

2

3

1

CC

V

0.01 µF

+

20 µF

4

5

IDCD5024

CC

V

P0.0

SCLK

MOSI

68HC05

XTAL

RST

CC

V

SCDQ554XX

SData

SDCLK

Load

2

3

1

CC

V

0.01 µF

+

20 µF

4

5