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Hardware Description

AVR STK500 User Guide

3-25

1925C–AVR–3/03

3.9.1

Signal Descriptions

The signals AUXI1, AUXI0, AUXO1, and AUXO0 are intended for future use. Do not

connect these signals to your application.

The DATA[7:0] and CT[7:1] signals are also found on the Prog Data and Prog Ctrl con-

nectors. These signals and connectors are explained in Section 3.10 on page 3-25.

The BSEL2 signal is the same as that found on the BSEL2 jumper. This jumper is

explained in Section 3.8.5 on page 3-22.

The SI, SO, SCK, and CS signals are connected to the DataFlash. Use of the DataFlash

is described in Section 3.6 on page 3-6.

NC means that this pin is not connected.

The remaining signals are equal to those found on the PORT connectors, explained in

Section 3.4 on page 3-3.

Note:

DATA, CT, and AUX signals are based on 5V CMOS logic. No voltage conver-

sion to adapt to VTG is done on these signals.

3.10

Prog Ctrl and

Prog Data

Headers

The Prog Ctrl and Prog Data headers are used for High-voltage Programming of the tar-

get AVR device. The placement of the headers is shown in Figure 3-33. During parallel

High-voltage Programming, the Prog Ctrl signals are routed to PORTD of the target

device. The Prog Data signals are routed to PORTB. See Section 3.7.2 on page 3-11 for

a complete description of High-voltage Programming. The pinouts of the Prog Ctrl and

Prog Data headers are shown in Figure 3-36 and Figure 3-37. For more information

about High-voltage Programming of AVR devices, see the programming section of each

AVR datasheet.

Note:

Prog Ctrl and Data connectors are connected directly to the master microcon-

troller without level converters. This means that these signals are always 5V

logic.

Figure 3-36. Prog Ctrl Header Pinout

The Prog Ctrl signals are normally used for the control signals when parallel High-

voltage Programming an AVR device.

Note:

All Prog Ctrl signals are based on 5V CMOS logic. No voltage conversion to

adapt to VTG is done on these signals.

CT1(RDY/BSY)

CT3(/WR)

CT5(XA0)

CT7(PAGEL)

1 2

(OE)CT2

(BS1)CT4

(XA1)CT6

GND

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