8

guide.

High-Voltage Parallel Programming (HVPP)

HVPP programming is always available. The other programming modes, ISP and

JTAG programming, can be disabled. With HVPP, the other programming modes

can be enabled.

HVPP requires the target voltage to be set to 5V. If you have any external

hardware connected to STK500/STK503 that does not tolerate 5V, it must be

disconnected before you HVPP program the AVR.

Figure 4-2: HVPP programming the AVR

To HVPP program the AVR on STK503, follow these steps:

1.

Turn off power on STK500.

2.

Disconnect any hardware that does not tolerate 5V.

3.

Connect the PROGCTRL connector to PORTD and PROGDATA to

PORTB on the STK500 as show in the figure below.

4.

Set jumpers and switches according to Table 4-1.

5.

Connect a serial cable to the RS232 CTRL connector on STK500 and

your PC.

6.

Turn on power on STK500.

7.

Start AVR Studio. On the Tools menu, select "Program AVR/ Connect..."

8.

On the Board tab, make sure the VTarget slider shows 5V. If not, adjust it

and press Write Voltages .

You are now ready to program the device. For more information on how to use

the programming dialog, see the Frontend software section in the STK500 user

guide.