AT89LP51 datasheet(110/113 Pages) ATMEL

110 / 113 page

3709B–MICRO–12/10

AT89LP51/52 - Preliminary

Table of Contents (Continued)

Power Saving Modes ............................................................................. 33

8.1

Idle Mode .........................................................................................................33

8.2

Power-down Mode ...........................................................................................34

8.3

Reducing Power Consumption ........................................................................36

Interrupts ................................................................................................ 36

9.1

Interrupt Response Time .................................................................................37

I/O Ports .................................................................................................. 40

10.1

Port Configuration ............................................................................................40

10.2

Port Read-Modify-Write ...................................................................................43

10.3

Port Alternate Functions ..................................................................................44

Timer 0 and Timer 1 ............................................................................... 45

11.1

Mode 0 – 13-bit Timer/Counter ........................................................................46

11.2

Mode 1 – 16-bit Timer/Counter ........................................................................46

11.3

Mode 2 – 8-bit Auto-Reload Timer/Counter .....................................................47

11.4

Mode 3 – 8-bit Split Timer ...............................................................................47

11.5

Clock Output (Pin Toggle Mode) .....................................................................48

Timer 2 .................................................................................................... 50

12.1

Timer 2 Registers ............................................................................................51

12.2

Capture Mode ..................................................................................................52

12.3

Auto-Reload Mode ...........................................................................................52

12.4

Baud Rate Generator ......................................................................................54

12.5

Frequency Generator (Programmable Clock Out) ...........................................55

External Interrupts ................................................................................. 56

Serial Interface (UART) .......................................................................... 56

14.1

Multiprocessor Communications .....................................................................58

14.2

Baud Rates ......................................................................................................58

14.3

Framing Error Detection ..................................................................................60

14.4

Automatic Address Recognition ......................................................................60

14.5

More About Mode 0 .........................................................................................62

14.6

More About Mode 1 .........................................................................................68

14.7

More About Modes 2 and 3 .............................................................................70

AT89LP51 Datasheet(PDF) 110 Page - ATMEL Corporation

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