PIC32MX274F256BT-I/MM Integrated Circuits (ICs)

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Microcontrollers are essential in many electronic devices as they are used to manage hardware devices and perform real-time functions within embedded systems. The PIC32MX274F256BT-I/MM is an advanced 32-bit microcontroller from Microchip Technology that integrates various peripherals and features that make it suitable for various embedded systems. The device has a dual-core architecture and operates at a maximum frequency of up to 120 MHz, coupled with 256 kB Flash and 16 kB SRAM. This application note explains the features, operating modes, and programming as well as application field and working principle of the PIC32MX274F256BT-I/MM.

Features

The PIC32MX274F256BT-I/MM has a rich set of communication and clocking flash-based peripherals, making it suitable for a variety of applications. Its features include:

• 32-bit MIPS M4K Core operating up to 120 MHz
• 16 kB SRAM and 256 kB Flash
• Two-channel 10-bit Analog-to-Digital Converter (ADC)
• Programmable Low-Pin Count (PLP) Interface
• I/O pin count of 44
• Integrated watchdog timer

The device also includes timers, pulse width modulator (PWM), I2C, and various serial communication peripherals, including Serial Peripheral Interface (SPI) and Universal Asynchronous Receiver/ Transmitter (UART). The pin count of 44 enables the device to be used in small form-factor applications.

Operating Modes

The PIC32MX274F256BT-I/MM supports four different operating modes that allow for efficiency and flexibility in system design. The modes are:

• Normal mode – The device operates at maximum core frequency. All of its peripherals are active and they can be accessed through their respective registers.
• Sleep mode – The device is put into a low power state and the core clock frequency is halved. Most peripherals are not accessible in this mode.
• Idle mode – The core clock is kept active while the peripherals are put into a low-power state. The device can be woken up by a peripheral interrupt.
• Deep Sleep mode – In this mode, the device is powered down and consumes minimal power. It can only be woken up by a wake-up interrupt.

Programming

The PIC32MX274F256BT-I/MM is programmed using the free MPLAB X Integrated Development Environment (IDE) from Microchip. The IDE provides support for programming in C, C++, and assembly languages. It also provides an array of debugging features such as register view, breakpoints, variable watch, stack view, and more that can be used to debug and optimize code.

Application Field and Working Principle

The PIC32MX274F256BT-I/MM is suitable for a variety of applications such as industrial automation, motor control, sensor applications, serial communications, and more. Its integrated peripherals, dual-core architecture, and low power modes make it ideal for embedded applications.

As a microcontroller, the PIC32MX274F256BT-I/MM operates on a fetch-decode-execute cycle. It fetches instructions from the Flash memory and executes them sequentially. The instructions are decoded and the necessary hardware and processor resources are allocated according to the instructions, in order to carry out the desired operation.

The device can communicate with other external peripherals such as sensors and actuators through its programmable I/O pins and UART modules. It can also be programmed to work with other external and internal peripherals through its SPI and I2C bus protocols. The Dual Core Architecture allows for simultaneous execution of tasks, improving overall system performance.

The PIC32MX274F256BT-I/MM also includes numerous enabling features such as the PLP Interface and pin count of 44 which make it suitable for designs with small form factors and particularly in space-constrained applications that require significantly less PCB area.

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