N87C251

series introduction

# Introduction to the N87C251 Product Series

## Overview
The N87C251 product series represents a cutting - edge line of microcontrollers engineered to meet the diverse and demanding requirements of modern electronic systems. These microcontrollers are designed with a focus on high performance, reliability, and versatility, making them suitable for a wide range of applications across multiple industries.

## Key Features

### 1. High - Performance CPU
- The N87C251 series is powered by a high - speed central processing unit (CPU). It offers a clock speed that enables rapid execution of instructions, allowing for efficient processing of complex tasks. This high - performance CPU can handle real - time operations with ease, making it ideal for applications where quick response times are crucial, such as industrial automation and automotive control systems.
- It has a well - optimized instruction set architecture, which provides a good balance between code density and execution speed. This means that developers can write compact and efficient code, reducing the memory footprint of the application while maintaining high performance.

### 2. Memory Configuration
- **Program Memory**: These microcontrollers come with a generous amount of on - chip program memory. The flash memory in the N87C251 series provides non - volatile storage for the program code. This allows for easy reprogramming during the development phase and also enables firmware updates in the field. The large program memory capacity can accommodate complex algorithms and large - scale applications.
- **Data Memory**: Alongside the program memory, the N87C251 series offers sufficient data memory (RAM). The data memory is used for storing variables, intermediate results, and buffers during program execution. The ample data memory ensures smooth operation of applications that require significant data handling, such as data acquisition systems.

### 3. Peripheral Integration
- **I/O Ports**: The N87C251 microcontrollers are equipped with a rich set of input/output (I/O) ports. These ports can be configured in various modes, such as digital input, digital output, or analog input. The flexibility of the I/O ports allows for easy interfacing with external devices, including sensors, actuators, displays, and communication modules.
- **Timer/Counters**: Multiple timer/counter modules are integrated into the N87C251 series. These timers can be used for a variety of purposes, such as generating accurate time delays, measuring time intervals, and implementing pulse - width modulation (PWM) signals. PWM is widely used in motor control applications to regulate the speed and torque of motors.
- **Serial Communication Interfaces**: The product series supports several serial communication interfaces, including UART (Universal Asynchronous Receiver - Transmitter), SPI (Serial Peripheral Interface), and I²C (Inter - Integrated Circuit). These interfaces enable seamless communication with other devices, such as sensors, displays, and other microcontrollers. UART is commonly used for long - distance communication, while SPI and I²C are suitable for short - distance, high - speed communication between integrated circuits.

### 4. Low - Power Operation
- The N87C251 series is designed with power - saving features in mind. It offers multiple power - saving modes, such as idle mode and power - down mode. In idle mode, the CPU is halted while the peripherals can continue to operate, reducing power consumption without losing the context of the program. In power - down mode, the microcontroller consumes minimal power, making it ideal for battery - powered applications where energy efficiency is critical.

### 5. On - Chip Debugging and Programming
- These microcontrollers support on - chip debugging and programming capabilities. This allows developers to easily debug their applications using in - circuit emulators (ICE) or debuggers. The on - chip debugging features provide real - time access to the CPU registers,

Images for reference

44-PLCC

Datasheets

• 8xC251SA, SB, SP, SQ

Partlist