pic16f877 microcontroller

Figure 1. It consists of special function registers, interrupt entry, and sequential query logic circuits related to the interrupt, including five interrupt request sources, the four registers (ie, IP, Econ, and scon) used for interrupt control are used to control interrupt classes, interrupt enabling and shutting down, and determine the priority of various interrupt sources. Interrupt request source: (1) external interrupt request Source: namely, the External Interrupt 0 and 1, introduced thr

During the learning process of stm32, the first step on the establishment of the stm32 project will be difficult for many people, because it is not like other AVR 51 microcontroller, the configuration in options is more complex, the biggest headache among them is the selection box Preprocessor in the C/C ++ compiler option. Now I will describe the two items, first, I want to help students who want to learn stm32 to learn more quickly. Second, I want t

Icsp Interface Circuit Online serial programming icsp is one of the features of the PIC microcontroller.ProgramDirectly burn it into a single-chip microcomputer, and conduct online serial programming and debugging on the single-chip microcomputer. There are only five lines of the icsp interface circuit, which are VPP, VDD, VSS, PGD, and PGC in sequence. their connection with the PIC microcontroller is as follows: To ensure the safe and normal ope

IntroductionWhen an attacker makes a custom attack device, an attack chip is placed into the USB device, which is a very small and fully functional microcontroller development system, called teensy. With Teensy you can simulate a keyboard and mouse, when you plug in this custom USB device, the computer will be recognized as a keyboard, using the device's microprocessor and storage space and programming into the attack code, you can send control comma

method periodically exits and then enters a low-power state. If the system is running too fast, most of the power and CPU time is consumed by entering and exiting the low power state.The FreeRTOS tickless idle mode stops the periodic system beat interruption during idle cycles. Stopping periodic system beat interrupts allows the microcontroller to be in low-power mode for extended periods of time. The porting layer needs to configure an external wake

I. SUMMARY of programme ISSUESThe popularization of mobile Internet and the development of smart home, the development of the IoT, more and more small devices, offline devices need to connect to the Internet to form an interconnection, and service providers to provide more powerful updates service. But ordinary small equipment are low-cost very simple microcontroller-based chip, do not have the Internet function, it is not possible to run in a single-

MCS-51 Series MCU internal only two external interrupt source input, when the external interrupt source more than two, you have to expand, and here are two simple extension methods:First, the use of hardware requests and software Query method:This method is to introduce each interrupt source into the MCU external interrupt source input via hardware "or non (highly effective, such as CD4002)" (and, low-effective) gate(INT0 or INT1), while the external interrupt source is sent to an input-output p

the use of a/D and d/A, generally these chips are provided with independent analog Ground (AGND) and digital Ground (DGND) pin, in order to achieve high precision, good stability, it is best to have all the analog and digital connection of all devices, and finally will be simulated with the digital only at one point connection.⑦ INTR#引脚未连接, the TX-1C Test board reads A/d data is not used interrupt method, so it is not connected to the pin. The digital chip in the operation of the first to analy

Becoming a formal embedded development engineer is an arduous process. There are many techniques for developing high-reliability embedded systems from a well-developed development cycle to rigorous execution and system inspection. This article describes 7 easy-to-use and long-running techniques that can be helpful in ensuring that your system runs more reliably and captures abnormal behavior.Tip 1: Populate the ROM with known valuesSoftware developers tend to be a very optimistic bunch of people

Minimum system:A resonant circuit consisting of quartz crystals and capacitors is used in the ATMEGA16 pin XTAL1 and XTAL2 Sisu, and the oscillator source of the OSC (oscillator) oscillator circuit in the chip is used as the system clock source. A simpler circuit is to use the 4M RC oscillator directly on the chip, so that the C1, C2, R2 and 4M crystals can be omitted, the pins XTAL1 and XTAL2 floating, of course, the system clock frequency accuracy than the use of external crystals, but also su

 A wide range of single-chip, from low to high-end, withWuyisingle-chip computer as the representative of8single-chip microcomputer andARMas the representative of +Single -chip microcomputer, different grades of single-chip microcomputer to achieve the different methods of network interface. For likeARMand other high-end processors can typically run embedded operating systems such as embeddedLinux. For non-operating system requirements of the microcontroll