Register Operands Fetch ALU Operation Execute 4.8 Reset and Interrupt Handling The AVR provides several different interrupt sources. Note that LPM is not affected by the RAMPZ setting. Įxtended Z-pointer Register for ELPM/SPM - RAMPZ Bit Read/Write Initial Value For ELPM/SPM instructions, the Z-pointer is a concatenation of RAMPZ, ZH, and ZL, as shown in Figure 4-4. 4.6 Stack Pointer The Stack is mainly used for storing. X-register Y-register Z-register In the different addressing modes these address registers have functions as fixed displacement, automatic increment, and automatic decrement (see the instruction set reference for details). 4.5 General Purpose Register File The Register File is optimized for the. See the “Instruction Set Description” for detailed information. īit 0 – C: Carry Flag The Carry Flag C indicates a carry in an arithmetic or logic operation. This information can be used for altering program flow in order to perform conditional operations. Status Register The Status Register contains information about the result of the most recently executed arithme- tic instruction. In addition, the ATmega16U4/ATmega32U4 has Extended I/O space from 0圆0 - 0x0FF in SRAM where only the ST/STS/STD and LD/LDS/LDD instructions can be used. The I/O Memory can be accessed directly the Data Space locations following those of the Register File, 0x20 - 0x5F. The CPU must therefore be able to access memories, perform calculations, control. The main function of the CPU core is to ensure correct program execution. ĪVR CPU Core 4.1 Introduction This section discusses the AVR core architecture in general. Be aware that not all C compiler vendors include bit definitions in the header files and interrupt handling compiler dependent.
#Atmel dragon pinout how to#
3.3 Code Examples This documentation contains simple code examples that briefly show how to use various parts of the device.
#Atmel dragon pinout download#
Resources A comprehensive set of development tools, application notes and datasheets are available for download on. Should be connected to an external capac- itor (1♟). 2.2.12 UCAP USB Pads Internal Regulator Output supply voltage. UVCC USB Pads Internal Regulator Input supply voltage. The Port D output buffers have symmetrical drive characteristics with both high sink and source capability. Port C also serves the functions of special features of the ATmega16U4/ATmega32U4 as listed on page 2.2.5 Port D (PD7.PD0) Port 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). Only bits 6 and 7 are present on the product pinout. Port B also serves the functions of various special features of the ATmega16U4/ATmega32U4 as listed on 2.2.4 Port C (PC7,PC6) Port 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). Port B has better driving capabilities than the other ports.
The Port B pins are tri-stated when a reset condition becomes active, even if the clock is not running. The ATmega16U4/ATmega32U4 provides the following features: 16/32K bytes of In-System Programmable Flash with Read-While-Write capabilities, 512Bytes/1K bytes EEPROM, 1.25/2.5K bytes SRAM, 26 general purpose I/O lines (CMOS outputs and LVTTL inputs), 32. By executing powerful instructions in a single clock cycle, the ATmega16U4/ATmega32U4 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. Overview The ATmega16U4/ATmega32U4 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. Special Microcontroller Features – Power-on Reset and Programmable Brown-out Detection.
#Atmel dragon pinout serial#
īyte Oriented 2-wire Serial Interface – Programmable Watchdog Timer with Separate On-chip Oscillator – On-chip Analog Comparator – Interrupt and Wake-up on Pin Change – On-chip Temperature Sensor