Atmel AVR AT90S8515-4 Uživatelský manuál stáhnout pdf (Strana 15)

AN INTRODUCTION INTENDED FOR PEOPLE WITH NO PRIOR AVR KNOWLEDGE - AVRFREAKS.NET

Stepping through the Code

AVR Studio allows running the code at full speed until a given point, and then

halt. We will however take if nice and slow, and manually press a button for every

instruction that should be executed. This is called single-stepping the code.

Press [ F11 ] once. This is the key for single-stepping. Note that the yellow arrow

is now pointing at the <nobr>LDI Temp, 0xFF</nobr> instruction. This is the

instruction that is going to be executed next.

Press [ F11 ] once more. The LDI instruction is executed, and the arrow points to

the OUT instruction. The Temp Register has now the value 0xFF. (If you open the

"Register 16-31" tree you will see that R16 contains 0xFF. We defined Temp to be

R16, remember?)

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Atmel AVR AT90S8515-4 Uživatelský manuál Strana 15