AT89LP428 datasheet(145/149 Pages) ATMEL

145 / 149 page

3654A–MICRO–8/09

Features ..................................................................................................... 1

Pin Configurations ................................................................................... 2

1.1

28P3 – 28-lead PDIP .........................................................................................2

1.2

32A – 32-lead TQFP (Top View) .......................................................................2

1.3

32J – 32-lead PLCC ..........................................................................................2

1.4

32M1-A – 32-pad MLF(Top View) .....................................................................2

1.5

Pin Description ..................................................................................................3

Overview ................................................................................................... 5

2.1

Block Diagram ...................................................................................................6

2.2

Comparison to Standard 8051 ...........................................................................7

Memory Organization .............................................................................. 8

3.1

Program Memory ...............................................................................................9

3.2

Internal Data Memory ......................................................................................10

3.3

External Data Memory .....................................................................................11

3.4

In-Application Programming (IAP) ...................................................................14

Special Function Registers ................................................................... 15

Enhanced CPU ....................................................................................... 16

5.1

Enhanced Dual Data Pointers .........................................................................17

5.2

Restrictions on Certain Instructions .................................................................20

System Clock ......................................................................................... 20

6.1

Crystal Oscillator .............................................................................................21

6.2

External Clock Source .....................................................................................21

6.3

Internal RC Oscillator ......................................................................................22

6.4

System Clock Out ............................................................................................22

6.5

System Clock Divider ......................................................................................22

Reset ....................................................................................................... 23

7.1

Power-on Reset ...............................................................................................23

7.2

Brown-out Reset ..............................................................................................25

7.3

External Reset .................................................................................................26

7.4

Watchdog Reset ..............................................................................................26

7.5

Software Reset ................................................................................................26

AT89LP428 датащи(PDF) 145 Page - ATMEL Corporation

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