Hi..I am learning the assembly language of the Motorola MC68HC05 chip..and have some doubts regd the programming

LOOP BRA LOOP
followed by some instructions

Wat would this do?

As far as I know...BRA is Branch Always..tat wud mean it wud keep coming back to LOOP...so when does it come out of the LOOP and execute the instructions following it?

Thanks alot

: Hi..I am learning the assembly language of the Motorola MC68HC05 chip..and have some doubts regd the programming
:
: LOOP BRA LOOP
: followed by some instructions
:
: Wat would this do?
:
: As far as I know...BRA is Branch Always..tat wud mean it wud keep coming back to LOOP...so when does it come out of the LOOP and execute the instructions following it?
:
: Thanks alot
:
==============

I do not think it would exit this loop unless a another BRANCH condition was entered within the loop or a call to exit the program.

Hope this helps.

This message was edited by htakeuchi at 2005-7-20 22:12:47

---

: : Hi..I am learning the assembly language of the Motorola MC68HC05 chip..and have some doubts regd the programming
: :
: : LOOP BRA LOOP
: : followed by some instructions
: :
: : Wat would this do?
: :
: : As far as I know...BRA is Branch Always..tat wud mean it wud keep coming back to LOOP...so when does it come out of the LOOP and execute the instructions following it?
: :
: : Thanks alot
: :
: ==============
:
: I do not think it would exit this loop unless a another BRANCH condition was entered within the loop or a call to exit the program.
:
: Hope this helps.

This is an idle loop. The loop can only be "exited" by hardware interrupts. Microcontrollers generally have a number of peripherals that can be programmed to produce interrupts.