AT89LP51 Atmel Corporation, AT89LP51 Datasheet - Page 114

• Manufacturer Part Number: AT89LP51
• Manufacturer: Atmel Corporation

Specifications of AT89LP51

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 36
• Uart: 1
• Sram (kbytes): 0.25
• Eeprom (bytes): 256
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 3
• Isp: SPI
• Watchdog: Yes

Table of Contents (Continued)
ii
AT89LP51/52
8
9
10 I/O Ports .................................................................................................. 41
11 Timer 0 and Timer 1 ............................................................................... 46
12 Timer 2 .................................................................................................... 51
13 External Interrupts ................................................................................. 57
14 Serial Interface (UART) .......................................................................... 57
Power Saving Modes ............................................................................. 34
Interrupts ................................................................................................ 37
7.5
8.1
8.2
8.3
9.1
10.1
10.2
10.3
11.1
11.2
11.3
11.4
11.5
12.1
12.2
12.3
12.4
12.5
14.1
14.2
14.3
14.4
14.5
14.6
14.7
Software Reset ................................................................................................34
Idle Mode .........................................................................................................34
Power-down Mode ...........................................................................................35
Reducing Power Consumption ........................................................................37
Interrupt Response Time .................................................................................38
Port Configuration ............................................................................................41
Port Read-Modify-Write ...................................................................................44
Port Alternate Functions ..................................................................................45
Mode 0 – 13-bit Timer/Counter ........................................................................47
Mode 1 – 16-bit Timer/Counter ........................................................................47
Mode 2 – 8-bit Auto-Reload Timer/Counter .....................................................48
Mode 3 – 8-bit Split Timer ...............................................................................48
Clock Output (Pin Toggle Mode) .....................................................................49
Timer 2 Registers ............................................................................................52
Capture Mode ..................................................................................................53
Auto-Reload Mode ...........................................................................................53
Baud Rate Generator ......................................................................................55
Frequency Generator (Programmable Clock Out) ...........................................56
Multiprocessor Communications .....................................................................59
Baud Rates ......................................................................................................59
Framing Error Detection ..................................................................................61
Automatic Address Recognition ......................................................................61
More About Mode 0 .........................................................................................63
More About Mode 1 .........................................................................................68
More About Modes 2 and 3 .............................................................................70
3709D–MICRO–12/11