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General| Flash Memory | 8 KB |
|---|---|
| SRAM | 512 Bytes |
| EEPROM | 512 Bytes |
| Clock Speed | 8 MHz |
| I/O Pins | 32 |
| USART | 1 |
| Operating Temperature | -40°C to +85°C |
| Manufacturer | Atmel |
| Model | AT90S8515-8PI |
| Architecture | AVR 8-bit |
| Communication Interfaces | USART |
| Package | 40-pin PDIP |
Detailed technical specifications including power consumption, I/O, operating voltages, and speed grades.
Detailed description of each port's functionality, registers, and alternate functions.
Explains the function of pins like RESET, XTAL, ICP, OC1B, and ALE.
Overview of the 32 working registers, ALU, and indirect addressing modes.
Details on I/O memory space for peripherals and data space mapping.
Details on the X, Y, and Z registers used for indirect addressing.
Description of the Arithmetic Logic Unit's role and operations.
Details on In-System Programmable Flash and SRAM organization.
Explains how registers are accessed directly in instructions.
Covers direct register access and I/O register addressing.
Explains direct data addressing and indirect addressing with displacement.
Details indirect addressing, pre-decrement, and post-increment modes.
Covers indirect addressing with post-increment and LPM instruction.
Explains indirect (IJMP, ICALL) and relative (RJMP, RCALL) program addressing.
Details the EEPROM memory characteristics and organization.
Explains timing concepts for instruction execution and memory access.
Table listing I/O addresses, names, and functions for the MCU.
Details the AVR Status Register (SREG) bits and their functions.
Description of the 16-bit stack pointer and its usage.
Overview of interrupt sources, vectors, and priority levels.
Explains the three sources of MCU reset: Power-On, External, and Watchdog.
Details the behavior and timing of the Power-on Reset circuit.
Explains external reset conditions and watchdog timer reset function.
Describes GIMSK and GIFR for managing interrupt requests.
Details TIMSK for interrupt enables and TIFR for interrupt flags.
Covers external interrupt configuration and interrupt response timing.
Explains bits for SRAM enable, sleep modes, and interrupt sense control.
Describes the Idle and Power Down sleep modes and their wake-up sources.
Overview of the 8-bit and 16-bit Timer/Counters.
Details the prescaler selection and 8-bit Timer/Counter0.
Explains the TCCR0 register bits for Timer/Counter0 clock select.
Describes the TCNT1H and TCNT1L registers for Timer/Counter1 value.
Details TCCR1A bits for compare output mode and PWM selection.
Explains TCCR1B bits for input capture and clock select.
Describes the TCNT1H and TCNT1L registers for Timer/Counter1 value.
Details OCR1AH/AL and OCR1BH/BL for compare match functionality.
Covers ICR1 register and Timer/Counter1 PWM mode operation.
Details WDTCR bits for enabling, disabling, and prescaling the watchdog.
Describes EEARH and EEARL for specifying EEPROM addresses.
Details EEDR for data transfer and EECR for write enable control.
Lists key features of the SPI interface like full-duplex and master/slave operation.
Explains the Slave Select (SS) pin behavior in master and slave modes.
Details SPCR bits for SPI enable, interrupt, data order, and mode select.
Describes SPSR for status flags and SPDR for data transfer.
Details the UART transmitter process and block diagram.
Explains the UART receiver operation and block diagram.
Describes UCR bits for receiver/transmitter enable and character format.
Details USR bits for receive/transmit complete and error flags.
Explains the baud rate generator equation and UBRR settings.
Describes the UBRR register for setting the UART baud rate.
Details ACSR bits for disabling, output, and interrupt control.
Lists components like Port A, Port C, ALE, RD, WR for SRAM interface.
Covers Port A registers, I/O functions, and alternate functions.
Details Port B registers, I/O functions, and alternate functions.
Explains Port B digital I/O and its alternate pin configurations.
Covers Port C registers, I/O functions, and alternate functions.
Details Port D registers, I/O functions, and alternate functions.
Details lock bit protection modes and fuse bit configurations (SPIEN, FSTRT).
Information on device signature bytes for identification.
Describes parallel programming and signal name mapping.
Step-by-step algorithm to enter parallel programming mode.
Explains chip erase procedure and algorithm for programming Flash memory.
Algorithms for reading Flash/EEPROM and programming Fuse bits.
Procedures for programming/reading lock bits, fuse bits, and signature bytes.
Details timing parameters for parallel programming operations.
Describes programming via SPI bus while RESET is low.
Algorithm for serial programming and data polling for EEPROM.
Explains data polling for Flash programming to determine readiness.
Details timing parameters for serial programming operations.
Lists the absolute maximum ratings for device operation.
Details input/output voltage levels, leakage, and current specifications.
Covers power supply current and analog comparator characteristics.
Shows waveforms and parameters for external clock signals.
Details timing for accessing external SRAM.
Characteristics for external data memory access without wait states.
Characteristics for external data memory access with one wait state.
Graphs showing supply current in active, idle, and power-down modes.
Characteristics for analog comparator and watchdog oscillator frequency.
Graphs for pull-up resistor current, sink, source, and input hysteresis.
A comprehensive summary table of all I/O registers, their bits, and page references.
Lists arithmetic and logic instructions, their operands, and flags.
Summarizes branch instructions, conditions, and jump targets.
Lists data transfer, bit manipulation, and flag control instructions.
Details ordering codes based on speed, power supply, package, and temperature.
Provides dimensions and details for TQFP, PLCC, and PDIP packages.
