AT89LP216_06 datasheet(65/90 Pages) ATMEL

65 / 90 page

3621A–MICRO–6/06

AT89LP216 [Preliminary]

23. Programming the Flash Memory

The Atmel AT89LP216 microcontroller features 2K bytes of on-chip In-System Programmable

Flash program memory. In-System Programming allows programming and reprogramming of

the microcontroller positioned inside the end system. Using a simple 4-wire SPI interface, the In-

System programmer communicates serially with the AT89LP216 microcontroller, reprogram-

ming 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 devel-

opment in the lab, and when updating the software or parameters in the field. The ISP interface

of the AT89LP216 includes the following features:

• Four-wire SPI Programming Interface

• Active-low Reset Entry into Programming

• Slave Select allows multiple devices on same interface

• User Signature Array

• Flexible Page Programming

• Row Erase Capability

• Page Write with Auto-Erase Commands

• Programming Status Register

For more detailed information on In-System Programming, refer to the Application Note entitled

“AT89LP In-System Programming Specification”.

23.1

Physical Interface

In-System Programming utilizes the Serial Peripheral Interface (SPI) pins of an AT89LP216

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 an active-low

Slave Select (SS). When programming an AT89LP216 device, the programmer always operates

as the SPI master, and the target system always operates as the SPI slave. To enter or remain

in In-System Programming mode the device’s reset line (RST) must be held active (low). With

the addition of VCC and GND, an AT89LP216 microcontroller can be programmed with a mini-

mum of seven connections as shown in Figure 23-1.

Figure 23-1. In-System Programming Device Connections

AT89LP216

VCC

P1.3/RST

P1.7/SCK

P1.5/MOSI

GND

Serial Clock

Serial In

RST

P1.4/SS

P1.6/MISO

Serial Out

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