Digilent Cerebot II Reference Manual - Page 2
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Features of the ATmega64L include:
•
a serial peripheral interface (SPI)
•
two USART serial interfaces
•
Atmel TWI serial interface
•
eight 10-bit analog inputs
•
two 8-bit timer counters
•
two 16-bit timer counters
•
64KB program flash
•
2KB user EEPROM
•
4KB internal RAM
•
an analog comparator.
For more information on the ATmega64L
microcontroller, refer to the data sheet
available at www.atmel.com.
Functional Description
The Cerebot II is designed for embedded
control and robotic applications as well as
microprocessor experimentation. Firmware
suitable for many applications can be
downloaded to the Cerebot II's programmable
ATmega64L microcontroller.
The board has a number of connection
options, and is specially designed to work with
the Digilent line of Pmod peripheral modules
with various input and output functions. For
more information, see www.digilentinc.com.
The Cerebot II has two programming interface
options: The Digilent in-system-programming
option is accessed via connector J1. A Digilent
USB or parallel programming cable can be
attached to connector J1. The Digilent AVR
Programmer application, available from the
Digilent Web site, can be used to program the
board via the Digilent programming cable.
Alternatively, the Atmel AVRISP in-system
programmer can be used. The AVRISP is
connected to connector J2 and programming is
done using the Atmel in-system-programming
application built into the Atmel AVR Studio
software. The Cerebot II also provides the
ability to use the Atmel AVR JTAGICE mkII
debugging tool for programming the board and
debugging the user firmware.
www.digilentinc.com
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
The Cerebot II features a flexible power supply
routing system with a number of options for
powering the Cerebot II as well as peripheral
modules connected to the board.
Pmod Connectors
The Cerebot II has eight Pmod connectors for
connecting to Digilent Pmod peripheral
modules. There are two styles of Pmod
connector. The original Pmod connector
standard uses a six-pin-header style of
connectors providing four I/O signals, ground
and a switchable power connection. The power
connection is switchable between the
regulated 3.3V main board supply and the
unregulated input supply.
The newer Pmod connector standard uses a
12-pin (2x6) header connector and provides
eight signal pins, two grounds, and two
switchable power connections. The pin
arrangement is such that the new connector is
equivalent to two of the older connectors.
Digilent Pmod peripheral modules can either
be plugged directly into the connectors on the
Cerebot II or attached via cables. Digilent has
a variety of Pmod interconnect cables
available.
See the "Pmod Headers and SPI Connection"
section below for more information about
connecting peripheral modules and other
devices to the Cerebot II. It lists the header
connectors with their designed base function
and a mapping to the Atmega64L I/O register
ports. All pins can be used as general-purpose
digital I/O ports.
Power Supply Connectors
The Cerebot II may be powered via dedicated
power supply connectors, or it can be powered
through any of the board's Pmod connectors.
The Cerebot II can also be powered through
the servo power connector.
The Cerebot II is rated for external power from
3.6 to 9 volts DC. Using voltage outside this
Digilent, Inc.
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