参数资料
| 型号： | SW006015 |
| 厂商： | Microchip Technology |
| 文件页数： | 51/120页 |
| 文件大小： | 0K |
| 描述： | C COMPILER MPLAB C32 |
| 标准包装： | 1 |
| 类型： | 编译器 |
| 适用于相关产品： | PIC32 |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
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MPLAB ? C32 C COMPILER
USER ’S GUIDE
Chapter 3. Interrupts
3.1
3.2
3.3
INTRODUCTION
Interrupt processing is an important aspect of most microcontroller applications.
Interrupts may be used to synchronize software operations with events that occur in
real time. When interrupts occur, the normal flow of software execution is suspended
and special functions are invoked to process the event. At the completion of interrupt
processing, previous context information is restored and normal execution resumes.
PIC32MX devices support multiple interrupts, from both internal and external sources.
The devices allow high-priority interrupts to override any lower priority interrupts that
may be in progress.
The MPLAB C32 C compiler provides full support for interrupt processing in C or inline
assembly code. This chapter presents an overview of interrupt processing.
HIGHLIGHTS
Items discussed in this chapter are:
SPECIFYING AN INTERRUPT HANDLER FUNCTION
An interrupt handler function handles the context save and restore to ensure that upon
return from interrupt, the program context is maintained.
3.3.1
Handler Function Context Saving
The standard calling convention for C functions will already preserve zero , s0-s7 , gp ,
sp , and fp . k0 and k1 are used by the compiler to access and preserve non-GPR
context, but are always accessed atomically (i.e., in sequences with global interrupts
disabled), so they need not be preserved actively. In addition to the standard registers,
a handler function will actively preserve the a0-a3 , t0-t9 , v0 , v1 and ra registers.
An interrupt handler function will also actively save and restore processor status
registers that are utilized by the handler function. Specifically, the EPC , SR , hi and lo
registers are preserved as context.
Handler functions specified as priority level 7 (highest priority) will use a shadow
register set to preserve the general purpose registers, enabling lower latency entry into
the application code of the handler function.
3.3.2
Marking a Function as an Interrupt Handler
A function is marked as a handler function via either the interrupt attribute or the
interrupt pragma 1 . Each method is functionally equivalent to the other. The interrupt is
specified as handling interrupts of a specific priority level or for operating in single
vector mode.
1. Note that pre-processor macros are not expanded in pragma directives.
? 2007 Microchip Technology Inc.
DS51686A-page 47
相关PDF资料 |
PDF描述 |
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相关代理商/技术参数 |
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| SW006021-1 | 制造商:Microchip Technology 功能描述:MPLAB XC8 STANDARD COMPILER 制造商:Microchip Technology Inc 功能描述:COMPILER MPLAB XC8 STD 制造商:Microchip Technology Inc 功能描述:COMPILER MPLAB XC8 STANDARD 制造商:Microchip Technology Inc 功能描述:COMPILER, MPLAB XC8, STANDARD 制造商:Microchip Technology Inc 功能描述:MPLAB XC8 ANSI C Compiler for the PIC10 (12),(16),(18) (Workstation License) 制造商:Microchip Technology Inc 功能描述:MPLAB XC8 Standard Compiler 制造商:Microchip Technology Inc 功能描述:OPTOCOUPLERS; Core Architecture:PIC; Software Edition:Standard |
| SW006021-1N | 制造商:Microchip Technology 功能描述:MPLAB XC8 STANDARD COMPILER (F 制造商:Microchip Technology Inc 功能描述:MPLAB XC8 STANDARD COMPILER (FLOATING LICENSE) - Boxed Product (Development Kits) 制造商:Microchip Technology Inc 功能描述:COMPILER MPLAB XC8 STD FLOAT LIC 制造商:Microchip Technology Inc 功能描述:MPLAB XC8 Standard Compiler (Fltng Lic) |
| SW006021-2 | 制造商:Microchip Technology 功能描述:MPLAB XC8 PRO COMPILER WORKSTATION LICENSE 制造商:Microchip Technology Inc 功能描述:MPLAB XC8 PRO COMPILER - Boxed Product (Development Kits) 制造商:Microchip Technology Inc 功能描述:COMPILER MPLAB XC8 PRO 制造商:Microchip Technology Inc 功能描述:COMPILER, MPLAB XC8, PRO 制造商:Microchip Technology Inc 功能描述:MPLAB XC8 ANSI PRO Compiler for the PIC10 (12),(16),(18) (Workstation License) 制造商:Microchip Technology Inc 功能描述:MPLAB XC8 PRO Compiler 制造商:Microchip Technology Inc 功能描述:SOFTWARE TOOL, MPLAB XC8 PRO COMPILER; Core Architecture:PIC; Supported Families:PIC10, PIC16, PIC18; Software Edition:Linux; License Type:Floating - node; No. of User Licenses:1; Supported Hosts:- |
| SW006021-2C | 制造商:Microchip Technology Inc 功能描述:COMPILER MPLAB XC8 PRO CHI |
| SW006021-2N | 功能描述:开发软件 MPLAB XC8 PRO Compiler (Fltng Lic) RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors |
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