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Digilent Cerebot II Reference Manual

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Revision: September 14, 2007
Note: This document applies to REV B of the board.
Overview
The Cerebot II board is a useful tool for
embedded control and robotics projects for
both students and hobbyists.
Its versatile design and programmable
microcontroller lets you access numerous
peripheral devices and program the board for
multiple uses. The board has many I/O
connectors and power supply options and
supports a number of programming options
including the free Atmel AVR
WinAVR.
The Cerebot II has a number of connections
for peripheral devices. It provides eight
connectors for attaching Digilent Pmod™
peripheral modules. Digilent peripheral
modules include H-bridges, analog-to-digital
and digital-to-analog converters, speaker
amplifier, switches, buttons, LEDs, as well as
converters for easy connection to RS232,
screw terminals, BNC jacks, servo motors, and
more.
Features include:
•
an ATmega64L microcontroller
•
eight hobby RC servo connectors
•
eight Pmod connectors for Digilent
peripheral module boards
•
an on-board voltage regulator
•
multiple flexible power supply jumper
options
•
support for the Digilent JTAG-3 Parallel
and JTAG-USB programming cables
•
support for the Atmel AVRISP in-
system programmer
•
support for the Atmel AVR JTAGICE
mkII debugging tool
•
ESD protection and short circuit
protection for all I/O pins.
Doc: 502-128
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
B
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Studio 4, and
®
www .d ig ilen tinc .c om
215 E Main Suite D | Pullman, WA 99163
(509) 334 6306 Voice and Fax
Various power
User Input
4 LEDs
connectors
Jumper
GND
VCC
3.3V
regulator
64K Flash
(Internal)
ATmega64L
2K EEPROM
(Internal)
4K SRAM
(Internal)
8
8
8
8
JA
JB
JC
JD
Mem
Mem
Mem
SPI
Adr/
Adr
Ctl
TWI
Data
UART
UART
Eight Pmod connectors
Cerebot II Circuit Diagram
Reset
8MHz
button
crystal
Atmel
ICE port
Internal
Oscillator
TQ64
UART, SPI,
&TWI ports
4
4
4
8
JE
JF
JG
JH
H-bridge
H-bridge
H-bridge
Analog
&
&
LEDs
JTAG
page 1 of 9
®
Digilent
ISP port
Atmel
ISP port
8
Eight servo
connectors

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Summary of Contents for Digilent Cerebot II

  • Page 1 Atmel AVR JTAGICE mkII debugging tool • ESD protection and short circuit protection for all I/O pins. Doc: 502-128 page 1 of 9 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.

  • Page 2: Functional Description

    The Cerebot II is rated for external power from debugging the user firmware. 3.6 to 9 volts DC. Using voltage outside this www.digilentinc.com page 2 of 9 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
  • Page 3 Pmod header connector. Place the power the power connectors, and will get warm when select jumper associated with the Pmod www.digilentinc.com page 3 of 9 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
  • Page 4 If servos are being driven on some channels and analog voltages are being read on other pins simultaneously, it is www.digilentinc.com page 4 of 9 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.

  • Page 5: Programming Options

    This port can be enabled or disabled using a fuse bit which can be set with any of www.digilentinc.com page 5 of 9 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.

  • Page 6: Crystal Oscillator

    6 of 9 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
  • Page 7 External memory bus Pins 7-9 connect to the control signals of the ATmega64 external memory bus interface. TOSC2 www.digilentinc.com page 7 of 9 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
  • Page 8 JH as a JTAG device input (e.g., to use the Atmel JTAGICE mkII). The pins on JH are shared with the servo connectors S1-S8. www.digilentinc.com page 8 of 9 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.

  • Page 9: Jumper Blocks

    Connect the RC hobby servo power bus to the unregulated supply bus, VU. When a shorting block is in place on this jumper, servo power is supplied from VU on the Cerebot II. If the jumper block is removed, the RC hobby servo power bus must be supplied with a source connected to the screw terminal block, J10.

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