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ATMEGA328P Datasheet(PDF) 6 Page - ATMEL Corporation |
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ATMEGA328P Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 32 page ![]() 6 8271BS–AVR–04/10 ATmega48A/48PA/88A/88PA/168A/168PA/328/328P 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 con- ventional CISC microcontrollers. The ATmega48A/48PA/88A/88PA/168A/168PA/328/328P provides the following features: 4K/8K bytes of In-System Programmable Flash with Read-While-Write capabilities, 256/512/512/1K bytes EEPROM, 512/1K/1K/2K bytes SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible Timer/Counters with compare modes, internal and external interrupts, a serial programmable USART, a byte-oriented 2-wire Serial Interface, an SPI serial port, a 6-channel 10-bit ADC (8 channels in TQFP and QFN/MLF packages), a pro- grammable Watchdog Timer with internal Oscillator, and five software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, USART, 2-wire Serial Interface, 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. In Power-save mode, the asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except asynchronous timer and ADC, to minimize switching noise during ADC conversions. In Standby mode, the crystal/resonator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up com- bined with low power consumption. The device is manufactured using Atmel’s high density non-volatile memory technology. The On-chip ISP Flash allows the program memory to be reprogrammed In-System through an SPI serial interface, by a conventional non-volatile memory programmer, or by an On-chip Boot pro- gram running on the AVR core. The Boot program can use any interface to download the application program in the Application Flash memory. Software in the Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip, the Atmel ATmega48A/48PA/88A/88PA/168A/168PA/328/328P is a powerful microcontroller that provides a highly flexible and cost effective solution to many embedded con- trol applications. The ATmega48A/48PA/88A/88PA/168A/168PA/328/328P 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. 2.2 Comparison Between Processors The ATmega48A/48PA/88A/88PA/168A/168PA/328/328P differ only in memory sizes, boot loader support, and interrupt vector sizes. Table 2-1 summarizes the different memory and inter- rupt vector sizes for the devices. Table 2-1. Memory Size Summary Device Flash EEPROM RAM Interrupt Vector Size ATmega48A 4K Bytes 256 Bytes 512 Bytes 1 instruction word/vector ATmega48PA 4K Bytes 256 Bytes 512 Bytes 1 instruction word/vector ATmega88A 8K Bytes 512 Bytes 1K Bytes 1 instruction word/vector ATmega88PA 8K Bytes 512 Bytes 1K Bytes 1 instruction word/vector ATmega168A 16K Bytes 512 Bytes 1K Bytes 2 instruction words/vector |
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