ATMEGA64A-MU Atmel, ATMEGA64A-MU Datasheet - Page 5

• Manufacturer Part Number: ATMEGA64A-MU
• Description: MCU 8-Bit ATmega AVR RISC 64KB Flash 3.3V/5V 64-Pin MLF EP
• Manufacturer: Atmel

Specifications of ATMEGA64A-MU

• Package: 64MLF EP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 16 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 53
• Interface Type: SPI/USART
• On-chip Adc: 8-chx10-bit
• Number Of Timers: 4
• Ram Size: 4 KB
• Program Memory Size: 64 KB
• Program Memory Type: Flash
• Operating Temperature: -40 to 85 °C

2.2.1
2.3
2.3.1
2.3.2
2.3.3
2.3.4
8160CS–AVR–07/09
Pin Descriptions
ATmega103 Compatibility Mode
VCC
GND
Port A (PA7:PA0)
Port B (PB7:PB0)
By programming the M103C Fuse, the ATmega64A will be compatible with the ATmega103
regards to RAM, I/O pins and Interrupt Vectors as described above. However, some new fea-
tures in ATmega64A are not available in this compatibility mode, these features are listed below:
Digital supply voltage.
Ground.
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 ATmega64A as listed on
75.
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.
• One USART instead of two, asynchronous mode only. Only the eight least significant bits of
• One 16 bits Timer/Counter with two compare registers instead of two 16 bits Timer/Counters
• 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
• 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.
the Baud Rate Register is available.
with three compare registers.
configure different wait states to different External Memory Address sections.
ATmega64A
page
5