AT89LP51ED2-20MU Atmel, AT89LP51ED2-20MU Datasheet - Page 215

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

Specifications of AT89LP51ED2-20MU

• Rohs: yes
• Core: 8051
• 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: VQFN-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
• Processor Series: AT89x
• Program Memory Type: Flash
• Factory Pack Quantity: 360

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
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