Using the STK594 Top Module

2.7Two-Wire Serial Interface (TWSI)

The AT94K device includes dedicated I/O pins for the TWSI rather than sharing with the general purpose I/O pins.

Figure 2-8 shows the pinout of a header for the dedicated TWSI pins.

Figure 2-8. TWSI Header

1 2

SDA

SCL

 

 

TWSI

2.7.1

Description of

An AT17LV010-10CC 1-Mbit Configuration Memory is included on the STK594 for sup-

 

Configuration

plying the AT94K FPSLIC device with its configuration data, as well as for non-volatile

 

Memory Pins

data storage. The configurator is a high-density EEPROM with a TWSI interface. A

 

 

detailed datasheet of the Configuration Memory can be obtained from the Atmel web

 

 

site.

The configurator can be connected to the I/O pins of the embedded AVR microcontrol- ler. The 4-pin header marked CONFIG can be used for connecting the TWSI interface of the configurator to the I/O pins of the target AVR microcontroller. Two-wire cables are included with the STK500 for connecting the configurator to the I/O pins.

Figure 2-9 shows the pinout of a header for the Configuration Memory pins.

Figure 2-9.Configuration Memory Header

1 2

cSDA cSER_EN

cSCL N/C

 

 

CONFIG

 

 

 

2.8

External

Unlike traditional AVR microcontrollers, the AT94K device provides the option of having

 

Interrupts

separate I/O pins for the External Interrupts rather than sharing with the general purpose

I/O pins.

Figure 2-10 shows the pinout of a header for the dedicated External Interrupt pins.

Figure 2-10.External Interrupt Header

1 2 INTP0 INTP2

EXT

INTP1

INTP3

FPSLIC STK594 User Guide

2-5

2819A–FPSLI–07/02

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Atmel STK594 manual Two-Wire Serial Interface Twsi, External, Interrupts