The ISR (interrupt service routine) handler is a portion of your code that goes to a specific chunk of ROM (program memory). In this routine, you’ll first have to check for the interrupt source. Then, handle it respectively.

We’ll be writing ISR routines for PIC microcontrollers in MPLAB IDE with XC8 compiler. Let’s see how to properly write ISR handlers! [toc] The interrupt logic circuitry is the first thing to consider before planning for any interrupt-driven system.

2023年11月9日 · Interrupts pause the current program and transfer control to a specified user-written firmware routine called the Interrupt Service Routine (ISR). The ISR processes the interrupt event, then resumes normal program flow. This article shows how to enable and process interrupts on the PIC16F1xxx family of Enhanced Mid-Range PIC ® MCUs.

2017年8月3日 · 中断服务例程（isr）：使用特定的语法定义 isr，并在 isr 中处理中断事件。中断嵌套：支持中断嵌套，但需要合理配置以避免不必要的嵌套。

2025年2月8日 · ISR and IRR. The PIC chip has two interrupt status registers: the In-Service Register (ISR) and the Interrupt Request Register (IRR). The ISR tells us which interrupts are being serviced, meaning IRQs sent to the CPU. The …

2016年11月7日 · When an interrupt occurs, the interrupt flags are scanned inside the handler to determine the source of interrupt, and then the ISR for that interrupt source is called. The vectored inter- rupt controller module offers an alternative approach by using the Interrupt Vector Table (IVT). The IVT provides each interrupt source an interrupt vector.

2018年8月1日 · Instead of polling, we can define an interrupt routine that runs when any interrupt is received. Then, inside this interrupt service routine (ISR), we can check to see if an external signal was detected.

1) The ISR Vector is correct for the peripheral you are using (your device header should have macros for all of these, for example _TIMER_1_VECTOR_ for Timer 1. 2) The IPL number assigned matches how you have the IPL register for the associated peripheral.

2024年1月23日 · The application developer is responsible for writing an Interrupt Service Routine (ISR) to respond to the interrupt condition. In non-MCC applications, the developer inserts a compiler directive into the source, ensuring the compiler places a jump instruction at the interrupt vector address, whose destination is the application's ISR.

ISR(In Service Register)：服務中暫存器，在IRR中斷請求發送給CPU後，ISR中對應的bit將被設為1，表示已發送給CPU，但CPU尚未處理完畢。 IMR(Interrupt Mask Register)：中斷遮罩暫存器，用於遮罩中斷，當被遮罩後，硬體所發出的中斷將被忽略不管。