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ATMEGA649 Datasheet(PDF) 6 Page - ATMEL Corporation |
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ATMEGA649 Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 375 page 6 ATmega329/3290/649/6490 2552H–AVR–11/06 Comparison between ATmega329, ATmega3290, ATmega649 and ATmega6490 The ATmega329, ATmega3290, ATmega649, and ATmega6490 differs only in memory sizes, pin count and pinout. Table 1 on page 6 summarizes the different configurations for the four devices. Pin Descriptions The following section describes the I/O-pin special functions. V CC 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. Por t A also ser v es the fu nctio n s of va r i ou s sp ecia l f e a t ur es of t h e ATmega329/3290/649/6490 as listed on page 67. 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 has better driving capabilities than the other ports. Por t B also ser v es the fu nctio n s of va r i ou s sp ecia l f e a t ur es of t h e ATmega329/3290/649/6490 as listed on page 68. Port C (PC7..PC0) Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port C pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port C also serves the functions of special features of the ATmega329/3290/649/6490 as listed on page 71. Port D (PD7..PD0) Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up resistors are activated. The Port D pins are tri-stated when a reset condition becomes active, even if the clock is not running. Table 1. Configuration Summary Device Flash EEPROM RAM LCD Segments General Purpose I/O Pins ATmega329 32K bytes 1K bytes 2K bytes 4 x 25 54 ATmega3290 32K bytes 1K bytes 2K bytes 4 x 40 69 ATmega649 64K bytes 2K bytes 4K bytes 4 x 25 54 ATmega6490 64K bytes 2K bytes 4K bytes 4 x 40 69 |
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