AVR-P20 development board
Users Manual
All boards produced by Olimex are ROHS compliant
Revision A, October 2005
Copyright(c) 2009, OLIMEX Ltd, All rights reserved
Page 1
INTRODUCTION:
The
AVR Microcontrollers
are low-power CMOS 8-bit controller based on
the RISC architecture. The AVR core combines a rich instruction set with general
purpose working registers. All the registers are directly connected to the Arithmetic
Logic Unit (ALU), allowing two independent registers to be accessed in one single
instruction executed in one clock cycle. The resulting architecture is more code
efficient while achieving throughputs up to ten times faster than conventional CISC
microcontrollers.
AVR-P20 is prototype board for 20 pin AVR microcontrollers with STKxxx
compatible 10 pin ICSP connector
.
BOARD FEATURES:
•STK200
compatible ICSP 5x2 pin connector for in-circuit
programming with AVR-PG1B or AVR-PG2B
•RS232
Tx, Rx interface with MAX232 IC on socket
•10MHz
crystal on socket (user can replace with any value)
•reset
IC ZM33064
•reset
button
•general
purpose push button
•status
LED connected to PB7 via removable jumper
•DIL20
microcontroller socket
•selectable
+3.3V / +5V power supply voltage regulator
•extension
pin headers for each uC pin
•four
mounting holes 3.3 mm (0.13")
•FR-4,
1.5 mm (0,062"), green soldermask, white silkscreen
component print
•dimensions
100x80 mm (3.9x3.15")
Page 2
ELECTROSTATIC WARNING:
The AVR-P20 board is shipped in protective anti-static packaging. The board must
not be subject to high electrostatic potentials. General practice for working with
static sensitive devices should be applied when working with this board.
BOARD USE REQUIREMENTS:
Cables:
The cable you will need depends on the programmer/debugger you use. If
you use
AVR-PG1
, you will need RS232 cable, if you use
AVR-PG2
, you will
need LPT cable, if you use
AVR-ISP500
,
AVR-ISP500-TINY
or
AVR-ISP500-
ISO
, you will need 1.8 meter USB A-B cable.
Hardware:
Programmer – one of the Olimex AVR Programmers: AVR-PG1, AVR-
PG2, AVR-ISP500, AVR-ISP500-TINY, AVR-ISP500-ISO.
Page 3
SCHEMATIC:
Page 4
BOARD LAYOUT:
POWER SUPPLY CIRCUIT:
AVR-P20
is typically power supplied with min 9.0V DC max 12.0V DC, or min 6.0V
AC max 9.0V AC.
RESET CIRCUIT:
AVR-P20
reset circuit includes pin 5 of ICSP connector, pin 1 of U1, Reset scheme –
U3 and RESET button (RST).
CLOCK CIRCUIT:
Quartz crystal 10MHz is connected to AVR Microcontroller pin 4 (XTAL2) and pin
5 (XTAL1).
Page 5
NXP MCU
