What is ATmega128?

What is ATmega128?

ATmega128 is an AVR, 8-bit low power microcontroller that contains 64-pin interface and is based on RISC architecture. It is mainly used in an embedded system and industrial automation.

What is the special of r31 register?

A very special extra role is defined for the register pairs R26:R27, R28:R29 and R30:R31….Pointer-register.

Pointer Sequence Example
X+ Read/Write from/to adress X and increment the pointer afterwards by one LD R1,X+ ST X+,R1

What registers can use LDI?

Since ldi only works on registers 16 through 31, the mov instruction is a useful way to load a constant into one of the lower 16 registers.

How many R registers does the ATMEGA168 have?

The high-performance, low-power Microchip AVR® RISC-based CMOS 8-bit microcontroller combines 16 KB ISP flash memory with read-while-write capabilities, 512B EEPROM, 1 KB SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible timer/counters with compare modes, internal and external …

What is ATMEGA168?

The ATMEGA168-20AU is a high-performance, low-power 8-bit AVR RISC-based Microcontroller combines 512B EEPROM, an 8-channel/10-bit A/D converter (TQFP and QFN/MLF) and debugWIRE for on-chip debugging. The device supports a throughput of 20 MIPS at 20MHz and operates between 2.7 to 5.5V.

How many general purpose registers ATmega32?

32 general-
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.

What is the additional role of general purpose registers R26 R31 in the AVR microcontroller?

Registers R26 through R31 have some added functions to their general purpose usage. These registers are 16-bit address pointers for indirect addressing of the data space. The three indirect address registers (X, Y, and Z) are defined as described in the figure.

What is the concept of X Y Z register in AVR?

XYZ is a pointer register, either X or Y or Z. YZ is a pointer register, either Y or Z. s is a bit number in the status register (0 = C, 1 = Z, etc., see the list above) b is a bit number in a general-purpose or I/O register (0 = least significant, 7 = most significant)

What is a register AVR?

Registers are like shelves in the bookshelf of processor memory. In an 8-bit processor, like the AVR ATMega 16 we are using, the shelf can hold 8 books, where each book is a one bit binary number, a 0 or 1. Each shelf has an address in memory, so that the controller knows where to find it.

How many general purpose registers are present in AT90S2313 microcontroller?

The AT90S2313 provides the following features: 2K bytes of In-System Programmable Flash, 128 bytes EEPROM, 128 bytes SRAM, 15 general purpose I/O lines, 32 general purpose working registers, flexible Timer/Counters with compare modes, internal and external interrupts, a programmable serial UART, programmable Watchdog …

How many registers are in ATmega128?

ATmega128 The Atmel®AVR®core combines a rich instruction set with 32 general purpose working regis- ters. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle.

What is Atmel AVR Atmega128?

OverviewThe Atmel®AVR®ATmega128 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega128 achieves throughputs approaching 1MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

What is ATmega128 prog_commands $5?

ATmega128 PROG_COMMANDS ($5) The AVR specific public JTAG instruction for entering programming commands via the JTAG port. The 15-bit Programming Command Register is selected as data register. The active states are the following: † Capture-DR: the result of the previous command is loaded into the data register.

How do I enable ATmega128 data transmission?

ATmega128 Data Transmission – The USART Transmitter The USART Transmitter is enabled by setting the Transmit Enable(TXEN) bit in the UCSRB Register. When the Transmitter is enabled, the normal port operation of the TxD pin is overrid- den by the USART and given the function as the transmitter’s serial output.