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How to read Assembly

Yuncheng Lin

Can anybody help me to explain the following sequence ? I only had some expericence in coding x86 Assembly.

#pragma asm
CLR TR0
MOV A,#K_Timer0IntervalCompLo
ADD A,TL0
MOV TL0,A
MOV A,#K_Timer0IntervalCompHi
ADDC A,TH0
MOV TH0,A
NOP
NOP
NOP
NOP
SETB TR0
#pragma endasm

Thanks.

EricLin
eric.yc.lin@liteon.com

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  • 0

    These instructions stop 16-bit timer 0 to prevent its two 8-bit registers (TH0 and TL0) from changing while the MSB and LSB of a 16-bit "reload" constant (K_Timer0IntervalCompHi and K_Timer0IntervalCompLo) are added into that register pair. The NOPs presumably pad the timing out to match the reload, then the timer is started back up again.

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  • 0

    These instructions stop 16-bit timer 0 to prevent its two 8-bit registers (TH0 and TL0) from changing while the MSB and LSB of a 16-bit "reload" constant (K_Timer0IntervalCompHi and K_Timer0IntervalCompLo) are added into that register pair. The NOPs presumably pad the timing out to match the reload, then the timer is started back up again.

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