Chapter #4 Exercise Answer
Question 4.2. Which interrupt is the first one to occur on Cortex-M based
microcontroller?
Ans: Reset interrupt is the first interrupt entry in the interrupt vector table
Q# Which two operations are combined in CBZ assembly instruction?
Question 4.9. What are pseudo assembly instruction? Are those executed at compile
time or run time?
Ans: LDR{type}{cond} Rt , label
The LDR instruction, using the above-mentioned syntax, is called pseudo assembly
instruction. This is due to the fact that it is converted to an equivalent PC-relative addressing based
assembly instruction, during the compilation process. Executed at compilation time.
Q# How is the AREA assembler directive used to create code or data
sections in the memory?
Ans:
The AREA directive is used to instruct the assembler for a new code or data section. Sections are
independent, named individually, and comprise indivisible chunks of code or data that are
manipulated (control) by the linker. The general syntax for the AREA directive is given below.
AREA sectionname {,attr}{,attr}...
In the above expression sectionname is the name assigned by the user to a particular data or code
section. Some of the section names are conventional.
AREA Mydata , DATA , READWRITE
; Define a data section with section name Mydata
Q#