How many instructions does atmega328 have?

How many instructions does atmega328 have?

There are 32 general-purpose 8-bit registers, R0–R31. All arithmetic and logic operations operate on those registers; only load and store instructions access RAM. A limited number of instructions operate on 16-bit register pairs.

What is Z register in AVR?

X Y and Z registers are actually pairs of r27:r26, r29:r28 and r31:r30 registers. Each of them can be used as indirect pointers to SRAM: ld r16, X. with post-increment, or pre-decrement: ld r16, -Y st Z+, r16. But only Y and Z can be used with displacment ldd r16, Y + 10 std Z + 5, r16.

What is stack pointer in AVR?

The Stack Pointer is a special register in I/O Memory that points to space allocated in SRAM, referred to as The Stack. The Stack is used to temporarily store register values and return addresses when subroutines are called. The Stack Pointer is a 16-bit register defined in include files as SPH and SPL.

What is the meaning of 328 in ATmega328?

ATmega-328 has 32KB internal flash memory. ATmega328 has 1KB Electrically Erasable Programmable Read-Only Memory (EEPROM). This property shows if the electric supply supplied to the micro-controller is removed, even then it can store the data and can provide results after providing it with the electric supply.

How many comparators does the ATmega328 have?

How many comparators does the Atmega328 have? Explanation: A comparator is basically used for comparing voltages. It takes 2 voltages as input and outputs the higher of the two. The Atmega328 has 1 such comparator only.

What is BX ax Al and CX register?

For example, in multiplication operation, one operand is stored in EAX or AX or AL register according to the size of the operand. BX is known as the base register, as it could be used in indexed addressing. CX is known as the count register, as the ECX, CX registers store the loop count in iterative operations.

What is Sreg in AVR?

The Status Register in AVR The Status Register (SREG) contains information about the result of the most recently executed arithmetic instruction. This information can be used for altering program flow in order to perform conditional operations. • SREG is updated after any of ALU operations by hardware.

How many clock cycles does the LDI command take?

In the datasheet, all the instructions take up 16 bits (1 instruction word). Attempting it myself, I get 14 as the answer. Since ldi r20, 250 is called once (1 cycle), then the loop is called 6 times before overflow to zero occurs (6×2=12 cycles). And finally at the end, nop takes 1 cycle.

What is SPH and SPL?

The stack pointer is a 16-bit-pointer, accessable like a port. The double register is named SPH:SPL. SPH holds the most significant address byte, SPL the least significant. This is only true, if the AVR type has more than 256 byte SRAM. If not, SPH is undefined and must not and cannot be used.

What is stack initialization?

c++ c linux. When a process requests for memory and an operating system is giving some new pages to the process, the kernel should initialize the pages (with zeros for instance) in order to avoid showing potentially confident data that another process used.