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ATMEGA64 Datasheet(PDF) 4 Page - ATMEL Corporation

No. de pieza ATMEGA64
Descripción Electrónicos  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA64 Datasheet(HTML) 4 Page - ATMEL Corporation

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ATmega64(L)
2490F–AVR–12/03
The ATmega64 provides the following features: 64K bytes of In-System Programmable
Flash with Read-While-Write capabilities, 2K bytes EEPROM, 4K bytes SRAM, 53 gen-
eral purpose I/O lines, 32 general purpose working registers, Real Time Counter (RTC),
four flexible Timer/Counters with compare modes and PWM, two USARTs, a byte ori-
ented Two-wire Serial Interface, an 8-channel, 10-bit ADC with optional differential input
stage with programmable gain, programmable Watchdog Timer with internal Oscillator,
an SPI serial port, IEEE std. 1149.1 compliant JTAG test interface, also used for
accessing the On-chip Debug system and programming, and six software selectable
power saving modes. The Idle mode stops the CPU while allowing the SRAM,
Timer/Counters, SPI port, and interrupt system to continue functioning. The Power-
down mode saves the register contents but freezes the Oscillator, disabling all other
chip functions until the next interrupt or Hardware Reset. In Power-save mode, the asyn-
chronous timer continues to run, allowing the user to maintain a timer base while the
rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all
I/O modules except asynchronous timer and ADC, to minimize switching noise during
ADC conversions. In Standby mode, the crystal/resonator Oscillator is running while the
rest of the device is sleeping. This allows very fast start-up combined with low power
consumption. In Extended Standby mode, both the main Oscillator and the asynchro-
nous timer continue to run.
The device is manufactured using Atmel’s high-density non-volatile memory technology.
The On-chip ISP Flash allows the program memory to be reprogrammed In-System
through an SPI serial interface, by a conventional non-volatile memory programmer, or
by an On-chip Boot program running on the AVR core. The Boot Program can use any
interface to download the Application Program in the Application Flash memory. Soft-
ware in the Boot Flash section will continue to run while the Application Flash section is
updated, providing true Read-While-Write operation. By combining an 8-bit RISC CPU
with In-System Self-Programmable Flash on a monolithic chip, the Atmel ATmega64 is
a powerful microcontroller that provides a highly-flexible and cost-effective solution to
many embedded control applications.
The ATmega64 AVR is supported with a full suite of program and system development
tools including: C compilers, macro assemblers, program debugger/simulators, In-Cir-
cuit Emulators, and evaluation kits.
ATmega103 and
ATmega64 Compatibility
The ATmega64 is a highly complex microcontroller where the number of I/O locations
supersedes the 64 I/O location reserved in the AVR instruction set. To ensure backward
compatibility with the ATmega103, all I/O locations present in ATmega103 have the
same location in ATmega64. Most additional I/O locations are added in an Extended I/O
space starting from 0x60 to 0xFF (i.e., in the ATmega103 internal RAM space). These
location can be reached by using LD/LDS/LDD and ST/STS/STD instructions only, not
by using IN and OUT instructions. The relocation of the internal RAM space may still be
a problem for ATmega103 users. Also, the increased number of Interrupt Vectors might
be a problem if the code uses absolute addresses. To solve these problems, an
ATmega103 compatibility mode can be selected by programming the fuse M103C. In
this mode, none of the functions in the Extended I/O space are in use, so the internal
RAM is located as in ATmega103. Also, the extended Interrupt Vectors are removed.
The ATmega64 is 100% pin compatible with ATmega103, and can replace the
ATmega103 on current printed circuit boards. The application note “Replacing
ATmega103 by ATmega64” describes what the user should be aware of replacing the
ATmega103 by an ATmega64.


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