參數(shù)資料
型號(hào)： IQ80C52EXXX-12D
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44
封裝： CERAMIC, QFP-44
文件頁(yè)數(shù)： 2/108頁(yè)
文件大?。?/td> 3682K
代理商： IQ80C52EXXX-12D
10
8069R–AVR–06/2013
XMEGA A4
Not recommended for new designs -
Use XMEGA A4U series
7.
Memories
7.1
Features
Flash Program Memory
– One linear address space
– In-System Programmable
– Self-Programming and Bootloader support
– Application Section for application code
– Application Table Section for application code or data storage
– Boot Section for application code or bootloader code
– Separate lock bits and protection for all sections
– Built in fast CRC check of a selectable flash program memory section
Data Memory
– One linear address space
– Single cycle access from CPU
– SRAM
– EEPROM
Byte and page accessible
Optional memory mapping for direct load and store
– I/O Memory
Configuration and Status registers for all peripherals and modules
16 bit-accessible General Purpose Register for global variables or flags
– Bus arbitration
Safe and deterministic handling of CPU and DMA Controller priority
– Separate buses for SRAM, EEPROM, I/O Memory and External Memory access
Simultaneous bus access for CPU and DMA Controller
Production Signature Row Memory for factory programmed data
Device ID for each microcontroller device type
Serial number for each device
Oscillator calibration bytes
ADC, DAC and temperature sensor calibration data
User Signature Row
One flash page in size
Can be read and written from software
Content is kept after chip erase
7.2
Overview
The AVR architecture has two main memory spaces, the Program Memory and the Data Mem-
ory. In addition, the XMEGA A4 features an EEPROM Memory for non-volatile data storage. All
three memory spaces are linear and require no paging. The available memory size configura-
tions are shown in ”O(jiān)rdering Information” on page 2. In addition each device has a Flash
memory signature row for calibration data, device identification, serial number etc.
Non-volatile memory spaces can be locked for further write or read/write operations. This pre-
vents unrestricted access to the application software.
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