AT89C51ED2-RDTUM datasheet(134/137 Pages) ATMEL

134 / 137 page

135

4235K–8051–05/08

AT89C51RD2/ED2

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

Description ............................................................................................... 2

Block Diagram .......................................................................................... 3

SFR Mapping ............................................................................................ 4

Pin Configurations ................................................................................... 9

Port Types .............................................................................................. 14

Oscillator ................................................................................................ 15

6.1

Registers .........................................................................................................15

6.2

Functional Block Diagram ................................................................................16

Enhanced Features ................................................................................ 17

7.1

X2 Feature .......................................................................................................17

Dual Data Pointer Register (DPTR) ...................................................... 21

Expanded RAM (XRAM) ......................................................................... 23

9.1

Registers .........................................................................................................24

Reset ....................................................................................................... 26

10.1

Introduction ......................................................................................................26

10.2

Reset Input ......................................................................................................26

10.3

Reset Output ...................................................................................................26

Power Monitor ........................................................................................ 28

11.1

Description .......................................................................................................28

Timer 2 .................................................................................................... 30

12.1

Auto-reload Mode ............................................................................................30

12.2

Programmable Clock-output ............................................................................31

12.3

Registers .........................................................................................................32

Programmable Counter Array (PCA) .................................................... 35

13.1

PCA Capture Mode .........................................................................................43

13.2

16-bit Software Timer/ Compare Mode ...........................................................43

13.3

High Speed Output Mode ................................................................................44

13.4

Pulse Width Modulator Mode ..........................................................................45

13.5

PCA Watchdog Timer ......................................................................................46

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