one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.

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 con- tents but freezes the oscillator, disabling all other chip functions until the next external interrupt or hardware reset.

The device is manufactured using Atmel’s high-density nonvolatile memory technology. The On-chip In-System Programmable Flash allows the program memory to be repro- grammed 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 Pro- grammable Flash on a monolithic chip, the Atmel AT90S8515 is a powerful microcontroller that provides a highly flexible and cost-effective solution to many embed- ded 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, in-circuit emulators and evaluation kits.

Pin Descriptions

VCC

Supply voltage.

GND

Ground.

Port A (PA7..PA0)

Port A is an 8-bit bi-directional I/O port. Port pins can provide internal pull-up resistors

 

(selected for each bit). The Port A output buffers can sink 20 mA and can drive LED dis-

 

plays directly. When pins PA0 to PA7 are used as inputs and are externally pulled low,

 

they will source current if the internal pull-up resistors are activated. The Port A pins are

 

tri-stated when a reset condition becomes active, even if the clock is not active.

 

Port A serves as multiplexed address/data input/output when using external SRAM.

Port B (PB7..PB0)

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors. The Port B output

 

buffers can sink 20 mA. As inputs, Port B pins that are externally pulled low will source

 

current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset

 

condition becomes active, even if the clock is not active.

 

Port B also serves the functions of various special features of the AT90S8515 as listed

 

on page 66.

Port C (PC7..PC0)

Port C is an 8-bit bi-directional I/O port with internal pull-up resistors. The Port C output

 

buffers can sink 20 mA. As inputs, Port C pins that are externally pulled low will source

 

current if the pull-up resistors are activated. The Port C pins are tri-stated when a reset

 

condition becomes active, even if the clock is not active.

 

Port C also serves as address output when using external SRAM.

Port D (PD7..PD0)

Port D is an 8-bit bi-directional I/O port with internal pull-up resistors. The Port D output

 

buffers can sink 20 mA. As inputs, Port D pins that are externally pulled low will source

4 AT90S8515

0841GS–09/01

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Atmel AT90S8515-4 manual Pin Descriptions, Gnd
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AT90S8515-4 specifications

The Atmel AT90S8515-4 is a popular 8-bit microcontroller that belongs to the AVR family, which is widely recognized for its efficient and powerful performance in various embedded applications. It was designed primarily for use in control, automation, and consumer electronic devices, making it one of the go-to choices for developers seeking versatility and reliability.

One of the primary features of the AT90S8515-4 is its 8-bit RISC architecture, which allows for a high level of efficiency in instruction execution. This architecture supports a rich set of 32 general-purpose registers, which enable fast data manipulation and make the microcontroller capable of handling complex computations with minimal overhead. The microcontroller operates at clock speeds of up to 4 MHz, providing sufficient speed for a wide range of applications without incurring excessive power consumption.

The AT90S8515-4 comes with a substantial 8 KB of programmable Flash memory, allowing developers to store and execute code efficiently. Additionally, it includes 512 bytes of SRAM, which is essential for temporary data storage during program execution. The microcontroller also features 512 bytes of EEPROM, which is particularly useful for applications requiring non-volatile memory to retain settings or important data even after power loss.

Another important characteristic of the AT90S8515-4 is its versatile I/O capabilities. The microcontroller is equipped with 32 general-purpose I/O pins that can be configured for various digital input or output functions. Moreover, it features an integrated 10-bit Analog-to-Digital Converter (ADC) that simplifies the process of interfacing with analog sensors, enabling precise signal processing.

The AT90S8515-4 also incorporates several built-in communication interfaces, including USART for serial communication, which opens up possibilities for connecting to other devices and systems. This makes it ideal for applications such as data logging, sensor networks, and remote control systems.

In terms of power management, the AT90S8515-4 is designed to operate in various power modes, including a power-saving sleep mode, which prolongs battery life in portable and remote applications.

In summary, the Atmel AT90S8515-4 microcontroller offers a robust blend of features, including a high-performance RISC architecture, ample Flash and EEPROM memory, versatile I/O options, and integrated communication capabilities, making it a suitable choice for developers looking to create efficient and reliable embedded systems.
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