• AVR - High Performance and Low Power RISC Architecture
• 118 Powerful Instructions - Most Single Clock Cycle Execution
• 8K bytes of In-System Reprogrammable Flash
– SPI Serial Interface for Program Downloading
– Endurance: 1,000 Write/Erase Cycles
512 bytes EEPROM
– Endurance: 100,000 Write/Erase Cycles
512 bytes Internal SRAM
32 x 8 General Purpose Working Registers
32 Programmable I/O Lines
Programmable Serial UART
SPI Serial Interface
VCC: 2.7 - 6.0V
Fully Static Operation
– 0 - 8 MHz 4.0 - 6.0V,
– 0 - 4 MHz 2.7 - 4.0V
Up to 8 MIPS Throughput at 8 MHz
One 8-Bit Timer/Counter with Separate Prescaler
One 16-Bit Timer/Counter with Separate Prescaler
and Compare and Capture Modes
Dual PWM
External and Internal Interrupt Sources
Programmable Watchdog Timer with On-Chip Oscillator
On-Chip Analog Comparator
Low Power Idle and Power Down Modes
Programming Lock for Software Security
with 8K bytes
The AT90S8515 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 AT90S8515 achieves throughputs approaching 1 MIPS per MHz allowing
the system designer to optimize power consumption versus processing speed.
The AVR core combines a rich instruction set with 32 general purpose working registers. 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. The resulting architecture is more code efficient while achieving
throughputs up to ten times faster than conventional CISC microcontrollers.
Pin Configurations
Rev. 0841DS–06/98
Note: This is a sumary document. For the complete
76 page document, please visit our Web site at or e-mail at [email protected]
and request literature number 0841D.
Block Diagram
Figure 1. The AT90S8515 Block Diagram
The AT90S8515 provides the following features: 8K bytes
of In-System Programmable Flash, 512 bytes EEPROM,
512 bytes SRAM, 32 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 Timer
with internal oscillator, an SPI serial port and two software
selectable power saving modes. The Idle Mode stops the
CPU while allowing the SRAM, timer/counters, SPI port
and interrupt system to continue functioning. The power
down mode saves the register contents but freezes the
oscillator, disabling all other chip functions until the next
interrupt or hardware reset.
The device is manufactured using Atmel’s high density
non-volatile memory technology. The on-chip in-system
programmable Flash allows the program memory to be
reprogrammed in-system through an SPI serial interface or
by a conventional nonvolatile memory programmer. By
combining an enhanced RISC 8-bit CPU with In-System
Programmable Flash on a monolithic chip, the Atmel
AT90S8515 is a powerful microcontroller that provides a
highly flexible and cost effective solution to many embedded control applications.
The AT90S8515 AVR is supported with a full suite of program and system development tools including: C compilers, macro assemblers, program debugger/simulators, incircuit emulators, and evaluation kits.