HELP: _startupData.pZeroOut:1

[sunshixian]

hello,guys! I am new to freescale. when i read the start12.c, i cannot understand " _startupData.pZeroOut:1" ,is this the low two bytes of a 24bit address?Please help me! Thanks!

[CrasyCat · Accepted solution]

Hello

The instruction LDX   _startupData.pZeroOut:1 loads register X with the low 16-bits of the address from startupData.pZeroOut.

This notation is described in {Install}\\Help\PDF\Compiler_HC12.pdf, chapter Using the Compiler, section High-Level Inline Assembler for the Freescale HC(S)12 > Special Features > Addresses of Variables.

CrasyCat

[sunshixian]

Thanks a million. I really appreciate it.

[RadekS]

Just additional information:

S12(X) CPU reference manual

http://www.freescale.com/files/microcontrollers/doc/ref_manual/S12XCPUV2.pdf

You can find there detail description of every instruction.

I hope that help you.

[sunshixian]

Thanks a million. I really appreciate it.