No. As mentioned earlier, some exceptions push an error code onto the stack. To decrease the complexity, we handle this by pushing a dummy error code of 0 onto the stack for any ISR that doesn't push an error code already. This keeps a uniform stack frame. To track which exception is firing, we also push the interrupt number on the stack.
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Although more accurate, the term printed wiring board has fallen into disuse. A PCB populated with electronic components is called a printed circuit assembly (PCA), printed circuit board assembly or PCB assembly (PCBA).The IPC preferred term for assembled boards is circuit card assembly (CCA), and for assembled backplanes it is backplane assemblies.rinted circuit boards are used in all but the simplest electronic products. Alternatives to PCBs include wire wrap and point-to-point construction. PCBs require the additional design effort to lay out the circuit, but manufacturing and assembly can be automated.