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

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

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2819A–FPSLI–07/02