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AVR is a atmfga of microcontrollers developed by Atmel beginning in The Atmel AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit ALUallowing two independent registers to be accessed in one single instruction executed in one clock cycle.

The resulting architecture is more code efficient while achieving throughput up to ten times faster than conventional CISC microcontrollers.

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Here we go through ATmega8 pin diagram, block diagram, sleep mode 16pj features. 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.

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Note that the electrical characteristics of PC6 differ from those of the other pins of Port C.

A low level on this pin for longer than the minimum pulse length will generate a Datasyeet, 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.

ATmega8 Pin Diagram | ATmega8 Block Diagram & Description

Shorter pulses are not guaranteed to generate a reset. It should be externally connected to Vcc, even if the ADC is not used.

If the ADC is used, it should be connected to Vcc through a low-pass filter. Note that Port C 5…4 use digital supply voltage, Vcc.

These pins are powered from the analog supply and serve as bit ADC channels. 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 power-save 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 fast start-up eatasheet with low-power consumption.

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In general this mode used for saving the operational power requirement of microcontroller. It enables external interrupts, the 2-wire serial interface, and watchdog while disabling the external oscillator. It stops all generated clocks.

In this mode, only oscillator can operate by slowing all other operation of microcontroller. Detailed datasheet available here. More basic articles available in the learning corner. Log into your account. Tuesday, January 1, Home Resources Learning Corner.

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ATmega8 Pin Diagram | ATmega8 Datasheet

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