AST_MASK
pcb->P0LR = (pcb->P0LR & ~AST_MASK) | AST_ON; \
pcb->P0LR = (pcb->P0LR & ~AST_MASK) | AST_ON; \
pcb->P0LR = (pcb->P0LR & ~AST_MASK) | AST_ON; \
if (sva >= (pmap->pm_p0lr & ~AST_MASK))
pcb->P0LR = pm->pm_p0lr | (pcb->P0LR & AST_MASK);
pcb->P0LR = (pcb->P0LR & ~AST_MASK) | AST_PCB;