AT89LP51 Atmel Corporation, AT89LP51 Datasheet - Page 7

• 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

2.1
2.2
2.2.1
3709D–MICRO–12/11
Block Diagram
System Configuration
Fuse Options
Figure 2-1.
The AT89LP51/52 supports several system configuration options. Nonvolatile options are set
through user fuses that must be programmed through the flash programming interface. Volatile
options are controlled by software through individual bits of special function registers (SFRs).
The AT89LP51/52 must be properly configured before correct operation can occur.
Table 2-1
when the device is powered off, but can only be changed with an external device programmer.
For more information, see
Resonator
Crystal or
lists the fusable options for the AT89LP51/52. These options maintain their state even
AT89LP51/52 Block Diagram
Configurable I/O
Configurable I/O
Configurable I/O
Configurable I/O
Configurable I/O
4K/8K Bytes
Flash Code
Configurable
Oscillator
Port 1
Port 2
Port 3
Port 4
Port 0
Section 17.7 “User Configuration Fuses” on page
8051 Single Cycle CPU
Flash Data
256 Bytes
with 12-cycle Compatibility
256 Bytes
RAM
16-bit Timer 0
16-bit Timer 1
16-bit Timer 2
RC Auxiliary
Watchdog
Oscillator
UART
Interface
Timer
POR
BOD
XRAM
AT89LP51/52
86.
7