The first step is to create a new project. Making good use of the rich routine resources of Pingtou Ge can save a lot of time!In order to get more content online, you can first configure some paramete
The STRING string in PCB in PROTEL99 cannot be rotated. Please help me. As shown in the figure below, after clicking the red dot in the figure, the cursor automatically moves to the lower left corner
SP(R13)
Special registers
LR(R14)
1. When a subroutine exists, the return address of the subroutine is saved
2. When an abnormal interrupt occurs, save the return address of the abnormal mode