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A return from an interrupt handling routine takes four clock cycles. The lower the address the higher is the priority level. Bit 0 — IVCE: Port D also serves the functions of various special features of the ATmega32 as listed on page Bit 3 — WDE: The prescaler is free running, i.
Bit 2 — BORF: Set OC0 on compare match when downcounting. When using the CLI instruction to disable interrupts, the interrupts will be immediately disabled.
The PD2 pin can serve as an external interrupt source. The assembly code example requires that the r Some initial guidelines for choosing capacitors for use with crystals are given in Table 4. Stack Pointer The Stack is mainly used atmeya32 storing temporary data, for storing local variables and for storing return addresses after interrupts and subroutine calls.
To save power, the reference is not always turned on. Any logical change on INT0 generates an interrupt request.
Reusing the Temporary High Byte Register If writing to more than one qtmega32 register where the high byte is the same for all registers written, then the high byte only needs to be written once. Six of the 32 registers can be used as three bit indirect address register pointers for Data Space addressing — enabling efficient address calculations. Each bit timer has a single 8-bit register atmeya32 temporary storing of the high byte of the bit access.
In a single clock cycle an ALU operation using two register operands is executed, and the result is stored back to the destination register. Secondly, the CPU itself can execute instructions incorrectly, if the supply voltage is too low. When the low byte of a bit register is written by the CPU, the high byte stored in the temporary register, and the low byte written are both copied into the bit register in the same clock cycle.
The minimum pulse length is given in Table 15 on page All enabled interrupts can then interrupt the current interrupt routine.
ATMEGAPI Manu:AIMEL Package:DIP,8-bit AVR Microcontroller
The ALU supports arithmetic and logic operations between registers or between a constant and a register. This documentation contains simple code examples that briefly show how to use various parts of atmegq32 device. Depending of the mode of operation used, the counter is cleared, incremented, or decremented at each timer clock clkT0. Table 26 and Table 27 relate the alternate functions of Port B to the overriding signals shown in Atmeva32 26 on page An input capture can be triggered by software by controlling the port of the ICP1 pin.
The start-up time is atmwga32 in Table The examples assume that interrupts are controlled so that no interrupts will occur during execution of these functions. In particular, the following modules may need special consideration when trying to achieve the lowest possible power consumption. The compare match event will also set the Compare Flag OCF0 which can be used to generate an output compare interrupt request.
This makes the MCU less sensitive to noise. The direct addressing reaches the entire data space. The Indirect with Displacement mode reaches 63 address locations from the base address given by the Y- or Z-register.
The external interrupts can be triggered by a falling or rising edge or a low level INT2 is only an edge ztmega32 interrupt.
This allows very fast start-up combined with low-power consumption.