PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884

2006-03-30

13

Display Cycle Using Built-in ROM Example

Display message “Showtime.” Digit 0 is leftmost—closest to pin 1.

Logic levels: 0=Low, 1=High, X=Don’t care.

RST

CE

WR

RD

FL

A4

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

Operation

Display

0

X

1

1

1

X

X

X

X

X

X

X

X

X

X

X

X

X

Reset. No

Read/Write

Within 3 Clock

Cycles

All Blank

1

0

0

1

1

1

0

X

X

X

0

0

X

0

0

0

1

1

53% Brightness

Selected

All Blank

1

0

0

1

1

1

1

0

0

0

0

1

0

1

0

0

1

1

Write “S” to Digit 0

S

1

0

0

1

1

1

1

0

0

1

0

1

0

0

1

0

0

0

Write “H” to Digit 1

SH

1

0

0

1

1

1

1

0

1

0

0

1

0

0

1

1

1

1

Write “O” to Digit 2

SHO

1

0

0

1

1

1

1

0

1

1

0

1

0

1

0

1

1

1

Write “W” to Digit 3

SHOW

1

0

0

1

1

1

1

1

0

0

0

1

0

1

0

1

0

0

Write “T” to Digit 4

SHOWT

1

0

0

1

1

1

1

1

0

1

0

1

0

0

1

0

0

1

Write “I” to Digit 5

SHOWTI

1

0

0

1

1

1

1

1

1

0

0

1

0

0

1

1

0

1

Write “M” to Digit 6

SHOWTIM

1

0

0

1

1

1

1

1

1

1

0

1

0

0

0

1

0

1

Write “E” to Digit 7

SHOWTIME

Displaying User Defined Character Example

Load character “A” into UDC-5 and then display it in digit 2.

Logic levels: 0=Low, 1=High, X=Don‘t care

RST

CE

WR

RD

FL

A4

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

Operation

Display

0

X

1

1

1

X

X

X

X

X

X

X

X

X

X

X

X

X

Reset. No

Read/Write

Within 3 Clock

Cycles

All Blank

1

0

0

1

1

0

0

X

X

X

X

X

X

X

0

1

0

1

Select UDC-5

All Blank

1

0

0

1

1

0

1

0

0

0

X

X

X

0

1

1

1

0

Write into Row 1 of

UDC-5

All Blank

1

0

0

1

1

0

1

0

0

1

X

X

X

1

0

0

0

1

Write into Row 2 of

UDC-5

All Blank

1

0

0

1

1

0

1

0

1

0

X

X

X

1

0

0

0

1

Write into Row 3 of

UDC-5

All Blank

1

0

0

1

1

0

1

0

1

1

X

X

X

1

1

1

1

1

Write into Row 4 of

UDC-5

All Blank

1

0

0

1

1

0

1

1

0

0

X

X

X

1

0

0

0

1

Write into Row 5 of

UDC-5

All Blank

1

0

0

1

1

0

1

1

0

1

X

X

X

1

0

0

0

1

Write into Row 6 of

UDC-5

All Blank

1

0

0

1

1

0

1

1

1

0

X

X

X

1

0

0

0

1

Write into Row 7 of

UDC-5

All Blank

1

0

0

1

1

1

1

0

1

0

1

X

X

X

0

1

0

1

Write UDC-5 into

Digit 2

(Digit 2) A