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ATmega8515(L)

2512A–AVR–04/02

TheAVRcore combines a rich instruction set with32 generalpurpose working registers.

All the 32 registers are directly connected to theArithmeticLogicUnit (ALU), allowing

twoindependent registers to beaccessed in one singleinstruction executed in one clock

cycle. The resulting architectureis more codeefficient whileachieving throughputs up to

ten timesfaster than conventionalCISCmicrocontrollers.

The ATmega8515 provides the following features: 8Kbytes ofIn-System Programmable

Flash with Read-While-Write capabilities, 512 bytesEEPROM, 512 bytesSRAM, an

External memory interface,35generalpurpose I/Olines, 32generalpurpose working

registers, two flexibleTimer/Counters withcomparemodes, Internal andExternal inter-

rupts, a Serial Programmable USART, a programmable Watchdog Timerwith internal

Oscillator, a SPIserialport, and three software selectable powersaving modes.The Idle

mode stops the CPUwhileallowing the SRAM, Timer/Counters, SPIport, andInterrupt

system to continue functioning. ThePower-downmode saves the Registercontentsbut

freezes the Oscillator, disabling all otherchipfunctions until thenextinterruptorhard-

ware reset. In Standby mode, the crystal/resonatorOscillator isrunning whilethe restof

the deviceissleeping. This allows very fast start-upcombinedwithlow-power

consumption.

The deviceis manufactured using Atmel’shighdensity nonvolatilememory technology.

The On-chipISP Flash allows the program memory to be reprogrammedIn-System

through an SPIserial interface,bya conventional nonvolatilememory programmer, or

by an On-chipBoot program running on the AVR core. The boot program can useany

interfacetodownload theapplication program in theApplication Flash memory. Soft-

wareinthe Boot Flash section will continue to run whiletheApplication Flash section is

updated, providing true Read-While-Write operation. By combining an 8-bit RISC CPU

withIn-System Self-programmable Flash onamonolithicchip, theAtmel ATmega8515

is a powerful microcontroller that provides a highly flexibleandcosteffective solution to

many embeddedcontrol applications.

The ATmega8515 issupportedwith a full suite ofprogram andsystem development

tools including:CCompilers, Macroassemblers, Program debugger/simulators, In-cir-

cuit Emulators, andEvaluation kits.

Disclaimer Typical valuescontained in thisdata sheet are based on simulations andcharacteriza-

tion of other AVR microcontrollers manufactured on the same process technology. Min

andMax valueswill beavailableafter the deviceischaracterized.

AT90S4414/8515 and

ATmega8515

Compatibility

The ATmega8515 provides all the features of theAT90S4414/8515. Inaddition,several

newfeatures ar eadded.The ATmega8515 isbackward comp atible with

AT90S4414/8515 in most cases. However, some incompatibilitiesbetween thetwo

microcontrollers exist. To solve thisproblem, an AT90S4414/8515 compatibility mode

can be selectedbyprogramming the S8515CFuse. ATmega8515 is 100%pin compati-

ble with AT90S4414/8515, andcan replacetheAT90S4414/8515 on current printed

circuit boards. However, the location ofFuse bits and theelectricalcharacteristics dif-

fers between thetwo devices.

AT90S4414/8515 Compatibility

Mode

Programming the S8515CFuse will change the following functionality:

•Thetimedsequence forchanging the Watchdog Time-out period isdisabled. See

“TimedSequencesforChanging the Configuration of the Watchdog Timer”onpage

50 fordetails.

•The double buffering of the USART receive registers isdisabled. See “AVR USART

vs. AVR UART – Compatibility”onpage 133 fordetails.

•PORTE(2:1)will be set as output, and PORTE0 will be set as input.

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