AT89LP4052-20PI datasheet(87/90 Pages) ATMEL

87 / 90 page

3547F–MICRO–6/06

AT89LP2052/LP4052

Table of Contents

Description ............................................................................................... 1

Pin Configuration ..................................................................................... 2

2.120-lead PDIP/SOIC/TSSOP ......................................................................................2

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

Block Diagram .......................................................................................... 4

Memory Organization .............................................................................. 4

5.1Program Memory .......................................................................................................4

5.2Data Memory .............................................................................................................5

Special Function Registers ..................................................................... 6

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

7.1System Clock ............................................................................................................7

7.2Instruction Execution with Single-Cycle Fetch ...........................................................7

7.3Interrupt Handling ......................................................................................................7

7.4Timer/Counters ..........................................................................................................7

7.5Serial Port ..................................................................................................................7

7.6Watchdog Timer ........................................................................................................7

7.7I/O Ports ....................................................................................................................8

7.8Reset .........................................................................................................................8

Enhanced CPU ......................................................................................... 8

Restrictions on Certain Instructions .................................................... 10

9.1Branching Instructions .............................................................................................10

9.2MOVX-related Instructions, Data Memory ...............................................................10

System Clock ......................................................................................... 10

10.1Crystal Oscillator ...................................................................................................10

10.2External Clock Source ...........................................................................................10

10.3System Clock Out ..................................................................................................10

Reset ....................................................................................................... 11

11.1Power-on Reset .....................................................................................................11

11.2Brown-out Reset ....................................................................................................11

11.3External Reset .......................................................................................................11

11.4Watchdog Reset ....................................................................................................11

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