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Hardware Description

AVR STK500 User Guide

3-9

1925C–AVR–3/03

3.7.1

ISP Programming

In-System Programming uses the AVR internal SPI (Serial Peripheral Interface) to

download code into the Flash and EEPROM memory of the AVR. ISP programming

requires only V

CC, GND, RESET and three signal lines for programming. All AVR

devices except AT90C8534, ATtiny11 and ATtiny28 can be ISP programmed. The AVR

can be programmed at the normal operating voltage, normally 2.7 - 6.0V. No high-volt-

age signals are required. The ISP programmer can program both the internal Flash and

EEPROM. It also programs fuse bits for selecting clock options, start-up time and inter-

nal Brown-out Detector (BOD) for most devices.

High-voltage programming can also program devices that are not supported by ISP pro-

gramming. Some devices require High-voltage Programming for programming certain

fuse bits. See the High-voltage Programming section on page 3-11 for instructions on

how to use High-voltage Programming.

Because the programming interface is placed on different pins from part to part, three

programming headers are used to route the programming signals to the correct pins. A

6-wire cable is supplied for connecting the ISP signals to the target ISP header. A color

coding system and a number system are used to explain which target ISP header is

used for each socket.

During ISP programming, the 6-wire cable must always be connected to the header

marked “ISP6PIN”. When programming parts in the blue sockets, connect the other end

of the cable to the blue SPROG1 target ISP header. When programming parts in the

green socket, use the green SPROG2 target ISP header. And when programming parts

in the red sockets, use the red SPROG3 target ISP header.Table 3-2 shows which

socket suits which AVR device, and which SPROG target ISP header to use for ISP

programming.

The 6-wire cables should be connected directly from the ISP6PIN header to the correct

SPROG target ISP header. The cable should not be twisted. A colored wire on the cable

indicates pin 1. Confirm that this is connected to pin 1 on each of the headers.

When programming 8-pin devices, note the following: Pin 1 is used both as RESET and

as PB5 on some devices (ATtiny11, ATtiny12 and ATtiny15). Pin 1 on the 8-pin sockets

SCKT3400D1 and SCKT3400D1 are connected to PB5. The RESET signal used during

ISP programming is therefore not connected to pin 1 on these sockets. This signal must

be connected by placing a wire between RST and the PORTE header and PB5 on the

PORTB header.

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