AT89LP213 datasheet(65/90 Pages) ATMEL

65 / 90 page

3538A–MICRO–7/06

AT89LP213/214 [Preliminary]

23. Programming the Flash Memory

The Atmel AT89LP213/214 microcontroller features 2KB of on-chip In-System Programmable

Flash program memory. In-System Programming (ISP) 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 AT89LP213/214 microcontroller, repro-

gramming 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 AT89LP213/214 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 AT89LP213/214

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 AT89LP213/214 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 AT89LP213/214 microcontroller can be programmed with

a minimum of seven connections as shown in Figure 23-1.

Figure 23-1. In-System Programming Device Connections

AT89LP213/214

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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