ATMEGA165P View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA165P

8-bit Microcontroller with 16K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega165P

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 con-

ventional CISC microcontrollers.

The ATmega165P provides the following features: 16K bytes of In-System Programmable Flash

with Read-While-Write capabilities, 512 bytes EEPROM, 1K byte SRAM, 53 general purpose I/O

lines, 32 general purpose working registers, a JTAG interface for Boundary-scan, On-chip

Debugging support and programming, three flexible Timer/Counters with compare modes, inter-

nal and external interrupts, a serial programmable USART, Universal Serial Interface with Start

Condition Detector, an 8-channel, 10-bit ADC, a programmable Watchdog Timer with internal

Oscillator, an SPI serial port, and five software selectable power saving modes. The Idle mode

stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt system to con-

tinue 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 mod-

ules 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 sleep-

ing. This allows very fast start-up combined 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 ATmega165P is a powerful microcontroller that provides a highly flex-

ible and cost effective solution to many embedded control applications.

The ATmega165P 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 Pin Descriptions

2.2.1 VCC

2.2.2 GND

Digital supply voltage.

2.2.3

Ground.

Port A (PA7..PA0)

Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port A output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port A pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port A pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

4

8019IS–AVR–08/07

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