入门指南：Atmel AVR 微控制器编程与接口

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"《Grace, 编程与Atmel AVR微控制器接口》是一本深入浅出的教程，专为初学者和专业人士讲解Atmel公司的AVR微处理器，这种芯片在Arduino开发板上广泛使用。本书主要介绍了如何利用AVR进行各种硬件设备的编程和交互，如电机控制、液晶显示屏、GPS传感器、触摸垫、温度传感器、加速度计以及距离传感器等，涵盖了丰富的实际应用场景。章节内容包括但不限于：模拟到数字转换（ADC），数字输入输出（Digital I/O），中断处理（Interrupts），串行外设接口（SPI）以及串行通信技术。通过这些技术，读者能够掌握如何设计和构建基于AVR的系统，实现与外部世界的高效沟通和数据交换。作者Thomas Grace以实用的方式引导读者，从基础概念入手，逐步提升技能。书中还强调了编程实践和硬件应用的重要性，旨在培养读者的动手能力和创新思维。此外，本书还遵循版权规定，确保内容的合法使用，禁止任何形式的未经许可复制或传播。对于想要探索Atmel AVR微控制器世界，尤其是希望在嵌入式系统设计、物联网(IoT)或机器人技术领域发展的工程师来说，《编程与Interfacing ATMEL AVR Microcontrollers》是一本不可或缺的参考书籍。通过阅读和实践书中的内容，读者不仅能掌握核心技术，还能积累宝贵的实际项目经验。"

Again, each group of four binary digits makes a number from 0 to 9. This makes it conve-

nient to work with digital displays. Use BCD when working with seven-segment displays

and storage is not a problem. The invalid BCD numbers make this somewhat inefficient

in terms of storage. An 8-bit BCD number would range from 0 to 99, while an 8-bit base 2

number can range from 0 to 255. This means that 8-bit BCD numbers utilize 100 of 256

possibilities, or 39%. The advantage for BCD is that computer input and output of num-

bers is sometimes easier than binary.

Base 2: Adding and Subtracting

The rules for adding and subtracting binary numbers are the same rules as in base 10. We

have used base 10 for so long that it is second nature to us, but think of how you add and

subtract in base 10 and use the same procedure for binary.

In binary, the highest digit is a 1. If you add up a column and get more than 1 (a 2 or 3),

then that 2 or 3 has to go to the next column to the left as a carry, which is a 1. Here, there

is a carry from bit 1 to bit 2. The rightmost column is called bit zero.

00010

+ 0011

= 0101

Lots of carries here:

00101010101

+ 0010111011

= 01000010000

Try subtraction in base 10. Do it slowly and show the borrow. The 9 becomes an 8. You

carry 10 over because it is base 10. 10 is carried to the first column, making 11. Now take

6 from 11 to get 5.

− 6

=85

Back to binary. When you borrow a 1 from the left it becomes a value of 2 in the column

to the right because it is base 2. Here is the example of 2−1, which is 1. The 1 in bit posi-

tion 1 is borrowed over into bit position 0 and is written as 2. Now subtract.

010

− 01

=01

Number Systems 7

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入门指南：Atmel AVR 微控制器编程与接口

Atmel AVR Microcontroller Primer Programming and Interfacing

Demonstrate thorough understanding of LCD and matrix keypad, and its interfacing specification.

max30102 stm32

verilog spi ip

drives+both+logic+and+an+io+buffer

digital logic and microprocessor design with interfacing 2nd edition 答案

s3c2410_gpio_getpin()

matlab contains

labview Vision Utilities

stm32 gpio pin

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