SCSPTR_SPB0DT
| SCSPTR_SPB0IO | SCSPTR_SPB0DT;
r |= SCSPTR_SPB0DT;
r &= ~SCSPTR_SPB0DT;
| SCSPTR_SPB0IO | SCSPTR_SPB0DT;
SHREG_SCSPTR |= SCSPTR_SPB0DT;
SHREG_SCSPTR &= ~SCSPTR_SPB0DT;
if ((SHREG_SCSPTR & SCSPTR_SPB0DT) != 0) {