AT89LP51ED2-20AU Atmel, AT89LP51ED2-20AU Datasheet - Page 7

• Manufacturer Part Number: AT89LP51ED2-20AU
• Description: 8-bit Microcontrollers - MCU 64KB 20MHz 2.4V-5.5V
• Manufacturer: Atmel

Specifications of AT89LP51ED2-20AU

• Rohs: yes
• Core: 8051
• Processor Series: AT89x
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Operating Supply Voltage: 2.4 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: TQFP-44
• Mounting Style: SMD/SMT
• Data Rom Size: 4 KB
• Interface Type: 2-Wire, SPI, UART
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Program Memory Type: Flash
• Factory Pack Quantity: 160

AT89LP51RD2/ED2/ID2 Preliminary
AT89LP51RD2/ED2/ID2 also includes a compatibility mode that will enable classic 12 clock per
machine cycle operation for true timing compatibility with the Atmel AT89C51RD2/ED2.
The AT89LP51RD2/ED2/ID2 retains all of the standard features of the AT89C51RD2/ED2,
including: 64KB of In-System Programmable Flash program memory, 4KB of EEPROM
(AT89LP51ED2/ID2 Only), 256 bytes of RAM, 2KB of expanded RAM, up to 40 I/O lines, three
16-bit timer/counters, a Programmable Counter Array, a programmable hardware watchdog
timer, a keyboard interface, a full-duplex enhanced serial port, a serial peripheral interface (SPI),
on-chip crystal oscillator, and a four-level, ten-vector interrupt system. A block diagram is shown
in
Figure
2-1.
®
In addition, the Atmel
AT89LP51RD2/ED2/ID2 provides a Two-Wire Interface (TWI) for up to
400KB/s serial transfer; a 10-bit, 8-channel Analog-to-Digital Converter (ADC) with temperature
sensor and digital-to-analog (DAC) mode; two analog comparators; an 8MHz internal oscillator;
and more on-chip data memory than the Atmel AT89C51RD2/ED2 (4KB vs. 2KB EEPROM and
2048 vs. 1792 bytes ERAM).
Some standard features on the AT89LP51RD2/ED2/ID2 are enhanced with new modes or oper-
ations. Mode 0 of Timer 0 or Timer 1 acts as a variable 9–16 bit timer/counter and Mode 1 acts
as a 16-bit auto-reload timer/counter. In addition, each timer/counter may independently drive an
8-bit precision pulse width modulation output. Mode 0 (synchronous mode) of the serial port
allows flexibility in the phase/polarity relationship between clock and data.
The I/O ports of the AT89LP51RD2/ED2/ID2 can be independently configured in one of four
operating modes. In quasi-bidirectional mode, the ports operate as in the classic 8051. In input-
only mode, the ports are tristated. Push-pull output mode provides full CMOS drivers and open-
drain mode provides just a pull-down. Unlike other 8051s, this allows Port 0 to operate with on-
chip pull-ups if desired.
The AT89LP51RD2/ED2/ID2 includes an On-Chip Debug (OCD) interface that allows read-mod-
ify-write capabilities of the system state and program flow control, and programming of the
internal memories. The on-chip Flash and EEPROM may also be programmed through the
UART-based bootloader or the SPI-based In-System programming interface (ISP).
The TWI and OCD features are not available on the PDIP package. The AT89LP51ID2 is also
not available in the PDIP.
The features of the AT89LP51RD2/ED2/ID2 make it a powerful choice for applications that need
pulse width modulation, high speed I/O, and counting capabilities such as alarms, motor control,
corded phones, and smart card readers.
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