ATMEGA644P DATASHEET PDF

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High-performance, Low-power AVR? A — Power-down Mode A — Power-save Mode Pin Configurations Figure Min and Max values will be available after the device is characterized. 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. 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 Powersave mode, the asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. This allows very fast start-up combined with low power consumption. The boot program can use any interface to download the application program in the application Flash memory. Software in the Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-While-Write operation.

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. 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. 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. 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.

A low level on this pin for longer than the minimum pulse length will generate a reset, even if the clock is not running. The minimum pulse length is given in Table on page Shorter pulses are not guaranteed to generate a reset. For compatibility with future devices, reserved bits should be written to zero if accessed.

Some of the status flags are cleared by writing a logical one to them. Rr Rd? Load Indirect and Pre-Dec. Store Indirect and Pre-Dec. Ordering Information 6. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information and minimum quantities. Also Halide free and fully Green. For Speed vs.

Packaging Information 7. Dimensions D1 and E1 do not include mold protrusion. Allowable protrusion is 0. Dimensions D1 and E1 are maximum plastic body size dimensions including mold mismatch. Lead coplanarity is 0. Dimensions D and E1 do not include mold Flash or Protrusion. Mold Flash or Protrusion shall not exceed 0. Errata 8. A No known Errata. Datasheet Revision History Please note that the referring page numbers in this section are referred to this document.

The referring revision in this section are referring to the document revision. Updated note in Table on page Updated Table on page Updated Figure on page and Figure on page Initial revision. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice.

Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications.

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