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If selected, it will operate with no external components. Figure 29 shows a block diagram of the output compare unit. The foregoing information relates to product sold on, or after, the date shown below. Special procedures must be followed when accessing the bit registers.
Reserved 1 Clear OC0 on compare match when up-counting. Be aware that changing trigger source can trigger a cap- ture. Atkega32 this signal is cleared, the Output driver is enabled by the DDxn Register bit.
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There are close connections between how the counter behaves counts and how waveforms are generated on the Output Compare outputs OC1x. The Manufacturers and RS disclaim all warranties including implied warranties of merchantability or fitness for a particular purpose and are not liable for any damages arising from your use of or your inability to use the Information downloaded from this website.
These registers are bit address pointers for indirect addressing of the Data Space. The user software can poll this bit and wait for a zero before writing the next byte. Bit 7 — INTF1: In particular, the following modules may need special consideration when trying to achieve the lowest possible power consumption.
Any logical change on INT0 generates an interrupt request. The signal value is latched when the system clock goes low. In a typical ALU operation, two operands are output from the Register File, the operation is executed, and the result is stored back in the Register File — in one clock cycle. Activity on the pin will cause an interrupt request even if INT0 is configured as an output.
In the other sleep modes, the Analog Comparator is automatically disabled. Interrupt Vectors in ATmega32 Table While one instruction is being executed, the next instruction is pre-fetched from the program memory.
One 8-bit output operand and one 8-bit result input? For measuring frequency only, the clearing of the ICF1 Flag is not required if an interrupt handler is used. The compare match event will also set the Compare Flag OCF0 which can be used to generate an output compare interrupt request. The time-stamps can then be used to calculate frequency, duty-cycle, and other features of the signal applied.
This concept enables instructions to be executed in every clock cycle. Reset Sources The ATmega32 has five sources of reset: An external clock source can not be prescaled. When the low byte of a bit register is read by the CPU, the high byte of the bit register is copied into the temporary register in the same clock cycle as the low byte is read. This feature provides a way of generating a software interrupt.
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If DDxn is written logic one, Pxn is configured as an output pin. Any logical change on INT1 generates an interrupt request. Table 29 and Table 30 relate the alternate functions of Port C to the overriding signals shown in Figure 26 on page Bit 0 — IVCE: All interrupts have a separate interrupt vector in the interrupt vector table.
The diagram includes non-inverted and inverted PWM outputs. If the Global Interrupt Enable Register is cleared, none of the interrupts are enabled independent of the individual interrupt enable settings. Save this item to a new parts list.
However, when using the register or bit defines in a program, the precise form must be used i. However, if the Analog Comparator is set up to use the Internal Voltage Reference as input, the Analog Comparator should be disabled in all sleep modes.
When the low byte is read the high byte is copied into the high byte temporary register TEMP. When entering a sleep mode, all port pins should be configured to use minimum power. As inputs, Port B pins that are externally pulled low will source current if the pull-up resistors are activated.
Pulses on INT2 wider than the minimum pulse width given in Table 36 will generate an interrupt.
This increase comes in addition to the start-up time from the selected sleep mode. Bit 5 — INTF2: 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.
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The rising edge of INT0 generates an interrupt request. Brown-out Detector If the Brown-out Detector is not needed in the application, this module should be turned off.
This will reduce power consumption in Idle mode. The timing diagram for the fast PWM mode is shown in Figure The input capture unit includes a digital filtering unit Noise Canceler for reducing the chance of capturing noise spikes.