ATMEGA64L-8AUR Atmel, ATMEGA64L-8AUR Datasheet - Page 293
ATMEGA64L-8AUR
Manufacturer Part Number
ATMEGA64L-8AUR
Description
IC MCU AVR 64K 8MHZ 3V 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA64L-8AUR
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Latching of Fuses
Signature Bytes
Calibration Byte
Parallel
Programming
Parameters, Pin
Mapping, and
Commands
Signal Names
2490Q–AVR–06/10
The fuse values are latched when the device enters Programming mode and changes of the
fuse values will have no effect until the part leaves Programming mode. This does not apply to
the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on
Power-up in Normal mode.
All Atmel microcontrollers have a 3-byte signature code which identifies the device. This code
can be read in both Serial and Parallel mode, also when the device is locked. The three bytes
reside in a separate address space.
For the ATmega64 the signature bytes are:
1. 0x000: 0x1E (indicates manufactured by Atmel)
2. 0x001: 0x96 (indicates 64 Kbytes Flash memory)
3. 0x002: 0x02 (indicates ATmega64 device when 0x001 is 0x96)
The ATmega64 stores four different calibration values for the internal RC Oscillator. These bytes
resides in the signature row high byte of the addresses 0x000, 0x0001, 0x0002, and 0x0003 for
1, 2, 4, and 8 MHz respectively. During Reset, the 1 MHz value is automatically loaded into the
OSCCAL Register. If other frequencies are used, the calibration value has to be loaded manu-
ally, see “OSCCAL – Oscillator Calibration Register(1)” on page 43 for details.
This section describes how to parallel program and verify Flash Program memory, EEPROM
Data memory, Memory Lock bits, and Fuse bits in the ATmega64. Pulses are assumed to be at
least 250 ns unless otherwise noted.
In this section, some pins of the ATmega64 are referenced by signal names describing their
functionality during parallel programming, see
the following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.
The bit coding is shown in
When pulsing WR or OE, the command loaded determines the action executed. The different
Commands are shown in
Table
Table
123.
122.
Figure 138
and
Table
120. Pins not described in
ATmega64(L)
293
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