ATmega64_L.pdf

Features

• High-performance, Low-power AVR ® 8-bit Microcontroller

• Advanced RISC Architecture

– 130 Powerful Instructions – Most Single Clock Cycle Execution

– 32 x 8 General Purpose Working Registers + Peripheral Control Registers

– Fully Static Operation

– Up to 16 MIPS Throughput at 16 MHz

– On-chip 2-cycle Multiplier

• Non-volatile Program and Data Memories

– 64K Bytes of In-System Reprogrammable Flash

Endurance: 10,000 Write/Erase Cycles

– Optional Boot Code Section with Independent Lock Bits

In-System Programming by On-chip Boot Program

True Read-While-Write Operation

– 2K Bytes EEPROM

Endurance: 100,000 Write/Erase Cycles

– 4K Bytes Internal SRAM

– Up to 64K Bytes Optional External Memory Space

– Programming Lock for Software Security

– SPI Interface for In-System Programming

• JTAG (IEEE std. 1149.1 Compliant) Interface

– Boundary-scan Capabilities According to the JTAG Standard

– Extensive On-chip Debug Support

– Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface

• Peripheral Features

– Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes

– Two Expanded 16-bit Timer/Counters with Separate Prescaler, Compare Mode, and

Capture Mode

– Real Time Counter with Separate Oscillator

– Two 8-bit PWM Channels

– 6 PWM Channels with Programmable Resolution from 1 to 16 Bits

– 8-channel, 10-bit ADC

8 Single-ended Channels

7 Differential Channels

2 Differential Channels with Programmable Gain (1x, 10x, 200x)

– Byte-oriented Two-wire Serial Interface

– Dual Programmable Serial USARTs

– Master/Slave SPI Serial Interface

– Programmable Watchdog Timer with On-chip Oscillator

– On-chip Analog Comparator

• Special Microcontroller Features

– Power-on Reset and Programmable Brown-out Detection

– Internal Calibrated RC Oscillator

– External and Internal Interrupt Sources

– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby

and Extended Standby

– Software Selectable Clock Frequency

– ATmega103 Compatibility Mode Selected by a Fuse

– Global Pull-up Disable

• I/O and Packages

– 53 Programmable I/O Lines

– 64-lead TQFP and 64-pad MLF

• Operating Voltages

– 2.7 - 5.5V for ATmega64L

– 4.5 - 5.5V for ATmega64

• Speed Grades

– 0 - 8 MHz for ATmega64L

– 0 - 16 MHz for ATmega64

8-bit

Microcontroller

with 64K Bytes

In-System

Programmable

Flash

ATmega64

ATmega64L

Preliminary

Rev. 2490C–AVR–09/02

Pin Configuration

Figure 1. Pinout ATmega64

TQFP/MLF

PEN

RXD0/(PDI) PE0

(TXD0/PDO) PE1

(XCK0/AIN0) PE2

(OC3A/AIN1) PE3

(OC3B/INT4) PE4

(OC3C/INT5) PE5

(T3/INT6) PE6

(IC3/INT7) PE7

(SS) PB0

(SCK) PB1

(MOSI) PB2

(MISO) PB3

(OC0) PB4

(OC1A) PB5

(OC1B) PB6

PA3 (AD3)

PA4 (AD4)

PA5 (AD5)

PA6 (AD6)

PA7 (AD7)

PG2(ALE)

PC7 (A15)

PC6 (A14)

PC5 (A13)

PC4 (A12)

PC3 (A11)

PC2 (A10

PC1 (A9)

PC0 (A8)

PG1(RD)

PG0(WR)

Disclaimer

Typical values contained in this data sheet are based on simulations and characteriza-

tion of other AVR microcontrollers manufactured on the same process technology. Min

and Max values will be available after the device is characterized.

ATmega64(L)

2490C–AVR–09/02

ATmega64(L)

Overview

The ATmega64 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing

powerful instructions in a single clock cycle, the ATmega64 achieves throughputs approaching 1 MIPS per MHz, allowing

the system designer to optimize power consumption versus processing speed.

Block Diagram

Figure 2. Block Diagram

PF0 - PF7

PA0 - PA7

PC0 - PC7

VCC

GND

PORTF DRIVERS

PORTA DRIVERS

PORTC DRIVERS

AVCC

DATA REGISTER

PORTF

DATA DIR.

REG. PORTF

DATA REGISTER

PORTA

DATA DIR.

REG. PORTA

DATA REGISTER

PORTC

DATA DIR.

REG. PORTC

8-BIT DATA BUS

AGND

XTAL1

AREF

CALIB. OSC

ADC

INTERNAL

OSCILLATOR

XTAL2

JTAG TAP

PROGRAM

COUNTER

STACK

POINTER

WATCHDOG

TIMER

OSCILLATOR

ON-CHIP DEBUG

PROGRAM

FLASH

SRAM

MCU CONTROL

TIMING AND

CONTROL

RESET

BOUNDARY-

SCAN

INSTRUCTION

GENERAL

PURPOSE

REGISTERS

TIMER/

COUNTERS

PROGRAMMING

LOGIC

PEN

INSTRUCTION

DECODER

INTERRUPT

UNIT

CONTROL

LINES

ALU

EEPROM

STATUS

USART0

SPI

USART1

2-WIRE SERIAL

INTERFACE

DATA REGISTER

PORTE

DATA DIR.

REG. PORTE

DATA REGISTER

PORTB

DATA DIR.

REG. PORTB

DATA REGISTER

PORTD

DATA DIR.

REG. PORTD

DATA REG.

PORTG

DATA DIR.

REG. PORTG

PORTE DRIVERS

PORTB DRIVERS

PORTD DRIVERS

PORTG DRIVERS

PE0 - PE7

PB0 - PB7

PD0 - PD7

PG0 - PG4

The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 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.

2490C–AVR–09/02

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.

ATmega64(L)

2490C–AVR–09/02

ATmega64(L)

ATmega103 Compatibility

Mode

By programming the M103C Fuse, the ATmega64 will be compatible with the

ATmega103 regards to RAM, I/O pins and Interrupt Vectors as described above. How-

ever, some new features in ATmega64 are not available in this compatibility mode,

these features are listed below:

• One USART instead of two, asynchronous mode only. Only the eight least

significant bits of the Baud Rate Register is available.

• One 16 bits Timer/Counter with two compare registers instead of two 16 bits

Timer/Counters with three compare registers.

• Two-wire serial interface is not supported.

• Port G serves alternate functions only (not a general I/O port).

• Port F serves as digital input only in addition to analog input to the ADC.

• Boot Loader capabilities is not supported.

• It is not possible to adjust the frequency of the internal calibrated RC Oscillator.

• The External Memory Interface can not release any Address pins for general I/O,

neither configure different wait states to different External Memory Address

sections.

• Only EXTRF and PORF exist in the MCUCSR Register.

• No timed sequence is required for Watchdog Timeout change.

• Only low-level external interrupts can be used on four of the eight External Interrupt

sources.

• Port C is output only.

• USART has no FIFO buffer, so Data OverRun comes earlier.

• The user must have set unused I/O bits to 0 in ATmega103 programs.

Pin Descriptions

VCC

Digital supply voltage.

GND

Ground.

Port A (PA7..PA0)

Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each

bit). The Port A output buffers have symmetrical drive characteristics with both high sink

and source capability. As inputs, Port A pins that are externally pulled low will source

current if the pull-up resistors are activated. The Port A pins are tri-stated when a reset

condition becomes active, even if the clock is not running.

Port A also serves the functions of various special features of the ATmega64 as listed

on page 69.

Port B (PB7..PB0)

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each

bit). The Port B output buffers have symmetrical drive characteristics with both high sink

and source capability. As inputs, Port B pins that are externally pulled low will source

current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset

condition becomes active, even if the clock is not running.

Port B also serves the functions of various special features of the ATmega64 as listed

on page 70.

2490C–AVR–09/02

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