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Clear OC0 on compare match when downcounting. Figure 6 shows the parallel instruction fetches and instruction executions enabled by the Harvard architecture and the fast-access Register File concept.

If the hardware connected to the TDO pin does not pull up the logic level, power consumption will increase. This bit will always be read as zero. Configuring the Pin Each port pin consists of three register bits: The number of bits actually used is implementation dependent. This allows the CPU to read or write the entire bit counter value within one clock cycle via the 8-bit data bus.

When an interrupt occurs, the Global Interrupt Enable I-bit is cleared and all interrupts are disabled.

Atmel ATMEGA32-16PI, 8bit AVR Microcontroller, 16MHz, 1.024 kB, 32 kB Flash, 40-Pin PDIP

Shorter pulses are not guaranteed to generate an interrupt. Atmeag32 and C2 should always be equal for both crystals and resonators. Alternatively, OCF0 is cleared by writing a logic one to the flag.

This means that the direction of one port pin can be changed without unintentionally changing the direction of any other pin with the SBI and CBI instructions. The maximum and minimum propagation delays are denoted tpd,max and tpd,min respectively.


The lower the address the higher is the priority level. This sleep mode basically halts all generated clocks, allowing operation of asynchronous modules only. The simplest method to ensure a defined level of an unused pin, is to enable the internal pullup. This allows very fast start-up combined with low-power consumption. In a single clock cycle an ALU operation using two register operands is executed, and the result is stored back to the destination register.

This improves the noise environment for the ADC, enabling higher resolution measurements. The registers are clocked at the positive edge of the internal system clock clk.

However, when the noise canceler is enabled, additional logic is inserted before the edge detector, which increases the delay by four system clock cycles. From Extended Aymega32 mode, the device wakes up in six clock cycles.

The output from the clock select logic is. The start-up time is given in Table When the ADC is turned off and on again, the amtega32 conversion will be an extended conversion.

Edges on INT2 are registered asynchronously. However, note that the same rule of atomic operation described previously also applies in this case. It is recommended to have the Global Interrupt Flag cleared during all the ahmega32 to avoid these problems.

The Port A output buffers have symmetrical drive characteristics with both high sink and source capability.


All of the clocks need not be active at a given time. If an interrupt occurs during execution of a multi-cycle instruction, this instruction is completed before the interrupt is served. Half Afmega32 is useful in BCD arithmetic. For measuring frequency only, the clearing of the ICF1 Flag is not required if an interrupt handler is used. Interrupt Vectors in ATmega32 Table When pins PA0 to PA7 are used as inputs and are atmga32 pulled low, they will source current if the internal pull-up resistors are activated.


When no clock source is selected CS These registers are bit address pointers for indirect addressing of the Data Space. The OCR0 defines the top value for the counter, hence also its resolution.

The FOC0 bit is always read as zero. Figure 24 shows a timing diagram of the synchronization when reading an externally applied pin value. When the write access time has elapsed, the EEWE bit is cleared by hardware. When the AVR exits atmeega32 an interrupt, it will always return to the main program and execute one more instruction before any pending interrupt is served. No external capacitors are needed.

It is organized as a separate data space, in which single bytes can be read and written.