AT89LP51ED2-20AU Atmel, AT89LP51ED2-20AU Datasheet - Page 215
AT89LP51ED2-20AU
Manufacturer Part Number
AT89LP51ED2-20AU
Description
8-bit Microcontrollers - MCU 64KB 20MHz 2.4V-5.5V
Manufacturer
Atmel
Datasheet
1.AT89LP51ED2-20AAU.pdf
(254 pages)
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
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24.6
24.6.1
3714A–MICRO–7/11
In-System Programming (ISP)
Physical Interface
The Atmel AT89LP51RD2/ED2/ID2 microcontroller features 64K bytes of on-chip In-System
Programmable Flash program memory and 4K bytes of nonvolatile EPROM data memory. In-
System Programming allows programming and reprogramming of the microcontroller positioned
inside the end system. Using a simple 4-wire SPI interface, the programmer communicates seri-
ally with the AT89LP51RD2/ED2/ID2 microcontroller, reprogramming all nonvolatile memories
on the chip. In-System Programming eliminates the need for physical removal of the chips from
the system. This will save time and money, both during development in the lab, and when updat-
i n g t h e s o f t w a r e o r p a r a m e t e r s i n t h e f i e l d . T h e p r o g r a m m i n g i n t e r f a c e o f t h e
AT89LP51RD2/ED2/ID2 includes the following features:
For more detailed information on In-System Programming, refer to the Application Note entitled
“AT89LP In-System Programming Specification”.
The AT89LP51RD2/ED2/ID2 provides a standard programming command set with two physical
interfaces: a bit-serial and a byte-parallel interface. Normal Flash programming utilizes the Serial
Peripheral Interface (SPI) pins of an AT89LP51RD2/ED2/ID2 microcontroller. The SPI is a full-
duplex synchronous serial interface consisting of four wires: Serial Clock (SCK), Master-
In/Slave-out (MISO), Master-out/Slave-in (MOSI) and Slave Select (SS). When programming an
AT89LP51RD2/ED2/ID2 device, the programmer always operates as the SPI master, and the
target system always operates as the SPI slave. To enter or remain in Programming mode the
device’s reset line (RST) must be held active. With the addition of VDD and GND, an
AT89LP51RD2/ED2/ID2 microcontroller can be programmed with a minimum of eight connec-
tions as shown in
Figure 24-17. In-System Programming Device Connections
• Four-wire serial SPI Programming Interface or 12-pin Parallel Interface
• Selectable Polarity Reset Entry into Programming
• User Signature Array
• Flexible Page Programming
• Row Erase Capability
• Page Write with Auto-Erase Commands
• Programming Status Register
Serial Clock
Serial Out
Serial In
Figure
SS
24-17.
AT89LP51RD2/ED2/ID2 Preliminary
AT89LP51RD2/ED2/ID2
P1.7/SCK
P1.6/MISO
P1.5/MOSI
P1.4/SS
GND
VDD
POL
RST
GND or VDD
RST
215
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