AT89C51ED2-RDTUM datasheet(135/137 Pages) ATMEL

135 / 137 page

136

4235K–8051–05/08

AT89C51RD2/ED2

Serial I/O Port ......................................................................................... 48

14.1

Framing Error Detection ..................................................................................48

14.2

Automatic Address Recognition ......................................................................49

14.3

Registers .........................................................................................................51

14.4

Baud Rate Selection for UART for Mode 1 and 3 ............................................51

14.5

UART Registers ...............................................................................................54

Keyboard Interface ................................................................................ 59

15.1

Registers .........................................................................................................60

Serial Port Interface (SPI) ...................................................................... 63

16.1

Features ..........................................................................................................63

16.2

Signal Description ............................................................................................63

16.3

Functional Description .....................................................................................65

Interrupt System .................................................................................... 72

17.1

Registers .........................................................................................................73

17.2

Interrupt Sources and Vector Addresses .........................................................73

Power Management ............................................................................... 80

18.1

Introduction ......................................................................................................80

18.2

Idle Mode .........................................................................................................80

18.3

Power-Down Mode ..........................................................................................81

18.4

Registers .........................................................................................................83

Hardware Watchdog Timer ................................................................... 84

19.1

Using the WDT ................................................................................................84

19.2

WDT during Power-down and Idle ...................................................................85

ONCE® Mode (ON- Chip Emulation) ..................................................... 86

Power-off Flag ........................................................................................ 87

Reduced EMI Mode ................................................................................ 88

EEPROM Data Memory .......................................................................... 89

23.1

Write Data ........................................................................................................89

23.2

Read Data .......................................................................................................90

23.3

Registers .........................................................................................................91

Flash/EEPROM Memory ........................................................................ 93

24.1

Features ..........................................................................................................93

24.2

Flash Programming and Erasure .....................................................................93

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