Quiz 6.3

Sections start their location counters at zero. The .bss directives don't advance the counter, because they go off to a different section. Assembly instructions take up bytes of memory according to what they are and their addressing mode. Whenever a .sect happens the location counter is reset to zero. There is more in section 2 of this TI Manual on the Assembler. I'm not certain about these, but here is what I came up with, as my best guess. This quiz is more tailored to the old Assembly List file, that has a field for the section counter. Code Composer Studio

• 0x0000
• 0x0000
• 0x0000
• 0x0002
• 0x0008
• 0x000a
• 0x000c
• 0x000e
• 0x000e
• 0x0010
• 0x0002
• 0x0000
• 0x0000

You can get the Assembly List file by going into the Build Settings->Build->Advanced Options->Assembler, and tick the Generate listing file box. Here is the listing file I got using the MSP430G2553 processor.

MSP430 Assembler Unix v15.12.3 Tue Nov  1 17:48:13 2016

Tools Copyright (c) 2003-2015 Texas Instruments Incorporated
../main.asm                                                          PAGE    1

       1                     .cdecls        C,"msp430.h"    ; include c header
       2 000000               .bss    cnt,2           ; WDT second counter
       3 000002               .bss    cat,4
       4 000000               .text                   ; program section
       5 000000 4031  start:  mov.w   #0x0400,SP      ; set stack pointer
         000002 0400 
       6 000004 40B2          mov.w   #0x5a18,&WDTCTL ; set WD timer interval
         000006 5A18 
         000008 0000!
       7 00000a 40B2          mov.w   #0x00fa,&cnt    ; 1 sec WD counter
         00000c 00FA 
         00000e 0000!
       8 000010 43D2          mov.b   #0x01,&IE1      ; enable WDT interrupt
         000012 0000!
       9 000014 D3D2          bis.b   #0x01,&P1DIR    ; P1.0 output
         000016 0000!
      10 000018 D032          bis.w   #0x0018,SR      ; enable interrupts
         00001a 0018 
      11 000006               .bss    dog,2
      12 00001c E3D2  wdt_isr:        xor.b   #0x01,&P1OUT    ; toggle P1.0
         00001e 0000!
      13 000020 1300          reti                    ; return from interrupt
      14 000000               .sect   ".int10"                ; WDT vector section
      15 000000 0000!         .word   wdt_isr         ; Watchdog ISR
      16 000000               .sect   ".reset"                ; PUC vector section
      17 000000 0000!         .word   start           ; RESET ISR
      18                    .end

No Assembly Errors, No Assembly Warnings

You can see that my guess wasn't right. The second column of numbers is the location counter.  :-)