Periferal

Ethernet, USB

Ethernet Controller

• Pilihan:– Periferal eksternal, misal “Microchip ENC28J60”.

Harga ~ Rp 90k– IC mikrokontroler khusus, misal “Dallas DS80C400

Network Microcontroller”. Harga ~ Rp 200k

Dallas DS80C400

Ethernet Controller

Microchip ENC28J60

Universal Serial Bus

Cara interfacing:• Menggunakan chip khusus , misal buatan FTDI• Menggunakan on chip interface• Menggunakan port I/O (bit banging) dengan

software

Chip USB

• FT-232BL buatan FTDI Rp 65k ~ 85k

Blok Diagram FT-232BL

FTDI Basic Breakout buatan sparkfun.com

On Chip USB

• Hardware USB ada dalam chip yang sama dengan mikrokontroler

• Contoh– Atmel (32117s.pdf)– Texas Instrument: Stellaris LM3S3748

LM3S3748 Development BoardDevelopment Kit

Blok Diagram

Software Only USBdengan Port I/O standar

• V-USB: http://www.obdev.at/products/vusb/index.html

• USB Tiny

V-USB

• V-USB is a software-only implementation of a low-speed USB device for Atmel’s AVR® microcontrollers, making it possible to build USB hardware with almost any AVR® microcontroller, not requiring any additional chip.

• Lisensi: open source & komersial

Lisensi Komersial

Hardware V-USB

USBTiny• http://www.xs4all.nl/~dicks/avr/usbtiny/• USBtiny is a software implementation of the USB low-speed

protocol for the Atmel ATtiny microcontrollers. Of course, it will also work on the ATmega series. The software is written for an AVR clocked at 12 MHz. At this frequency, each bit on the USB bus takes 8 clock cycles, and with a lot of trickery, it is possible to decode and encode the USB waveforms by software. The USB driver needs approximately 1250 to 1350 bytes of flash space (excluding the optional identification strings), depending on the configuration and compiler version, and 46 bytes RAM (excluding stack space). The C interface consists of 3 to 5 functions, depending on the configuration.

• Lisensi: GNU

Hardware USB Tiny