AT89LP52 Atmel Corporation, AT89LP52 Datasheet - Page 79
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AT89LP52
Manufacturer Part Number
AT89LP52
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT89LP51.pdf
(117 pages)
Specifications of AT89LP52
Flash (kbytes)
8 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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89LP52-20AU
Manufacturer:
Atmel
Quantity:
250
Company:
Part Number:
AT89LP52-20JU
Manufacturer:
Atmel
Quantity:
110
Company:
Part Number:
AT89LP52-20MU
Manufacturer:
Atmel
Quantity:
490
17. Programming the Flash Memory
17.1
3709D–MICRO–12/11
Physical Interface
The Atmel AT89LP51/52 microcontroller features 8K bytes of on-chip In-System Programmable
Flash program memory and 256bytes of nonvolatile Flash data memory. In-System Program-
ming allows programming and reprogramming of the microcontroller positioned inside the end
system. Using a simple 3-wire SPI interface, the programmer communicates serially with the
AT89LP51/52 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 updating the software or
parameters in the field. The programming interface of the AT89LP51/52 includes the following
features:
For more detailed information on In-System Programming, refer to the Application Note entitled
“AT89LP In-System Programming Specification”.
The AT89LP51/52 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 AT89LP51/52 microcontroller. The SPI is a full-duplex synchronous
serial interface consisting of three wires: Serial Clock (SCK), Master-In/Slave-out (MISO), and
Master-out/Slave-in (MOSI)). When programming an AT89LP51/52 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 AT89LP51/52 microcontroller can be programmed with a min-
imum of seven connections as shown in
Figure 17-1. In-System Programming Device Connections
• Three-wire serial SPI Programming Interface or 11-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
P1.7/SCK
P1.6/MISO
P1.5/MOSI
GND
Figure
AT89LP51/52
17-1.
VDD
POL
RST
GND or VDD
RST
AT89LP51/52
79