MOV DIR/DIR 6 cycles (?) and SP out of allowed range

[jorge]

When simulating this code:

Code:

MOV $80,$81

 
True Time Simulator throws 6 cycles as the execution time for this instruction. QUESTION> How could I report this bug?

ANOTHER QUESTION> I've posted (by mistake) this message in the MCU 8-bit Forum:

I've initialized the Stack Pointer register using Freescale template:

_Startup:
            LDHX   #RAMEnd+1        ; initialize the stack pointer
            TXS

But when using PSHA instruction, True-Time Simulator generates this error:

Error: Attempt to push or pop with SP out of allowed range

I understand that in the Flexis QE128, the stack could be anywhere within RAM section, right? At the beginning SP register is loaded with $1800 (end of RAM section, wich runs from $0080 to $17FF). But when trying to push Accumulator, TT Simulator throws this message!

So, I tried to change manually SP register to $00FF and PSHA works nice.

Any help will be appreciated.

Jorge

The thread is here:

http://forums.freescale.com/freescale/board/message?board.id=8BITCOMM&thread.id=10024

Any help in moving the thread to this forum will be appreciated.

Jorge

[bigmac]

Hello Jorge,

I tested the MOV dir,dir instruction with the 'AW60 as the target, and using both CW 5.0 and CW 6.0.  In both cases the cycle count increased by 6 cycles, rather than 5.  This would appear to be a long standing bug within the simulator, be it a very minor one.

However, I was unable to repeat your problem with the stack initialisation, so it might be specific to the QE128.  Have you tried the following "traditional" method?

; Symbol defined by the linker for the end of the stack
  XREF __SEG_END_SSTACK

;**************************************************************
main:
_Startup: ; Initialize stack pointer
          LDHX   #__SEG_END_SSTACK
          TXS

Regards,

Mac

[CrasyCat]

Hello

In both cases, we need some reproducible project to investigate.

I would recommend you to submit a service request for each of the issue.

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CrasyCat