參數(shù)資料
型號: MC68HC08KH12A
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 163/178頁
文件大?。?/td> 925K
代理商: MC68HC08KH12A
MC68HC08KH12A Data Sheet, Rev. 1.1
Freescale Semiconductor
163
Chapter 16
Break Module (BRK)
16.1 Introduction
This section describes the break module. The break module can generate a break interrupt that stops
normal program flow at a defined address to enter a background program.
16.2 Features
Features of the break module include the following:
Accessible I/O Registers during the Break Interrupt
CPU-Generated Break Interrupts
Software-Generated Break Interrupts
COP Disabling during Break Interrupts
16.3 Functional Description
When the internal address bus matches the value written in the break address registers, the break module
issues a breakpoint signal (BKPT) to the SIM. The SIM then causes the CPU to load the instruction
register with a software interrupt instruction (SWI) after completion of the current CPU instruction. The
program counter vectors to $FFFC and $FFFD ($FEFC and $FEFD in monitor mode).
The following events can cause a break interrupt to occur:
A CPU-generated address (the address in the program counter) matches the contents of the break
address registers.
Software writes a logic one to the BRKA bit in the break status and control register.
When a CPU generated address matches the contents of the break address registers, the break interrupt
begins after the CPU completes its current instruction. A return from interrupt instruction (RTI) in the break
routine ends the break interrupt and returns the MCU to normal operation.
Figure 16-1
shows the structure
of the break module.
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