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ATMEGA64 Datasheet(PDF) 5 Page - ATMEL Corporation

Part No. ATMEGA64
Description  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
Download  23 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA64 Datasheet(HTML) 5 Page - ATMEL Corporation

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ATmega64(L)
2490LS?AVR?10/06
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 74.
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 75.


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