TCSR_PWM_SET
tcsr0 = (TCSR_PWM_SET & ~TCSR_ENT) | (tcsr0 & TCSR_UDT);
tcsr1 = TCSR_PWM_SET | TCSR_ENALL | (tcsr1 & TCSR_UDT);
#define TCSR_PWM_MASK (TCSR_PWM_SET | TCSR_PWM_CLEAR)
return ((TCSR_PWM_MASK | TCSR_CASC) & tcsr0) == TCSR_PWM_SET &&
(TCSR_PWM_MASK & tcsr1) == TCSR_PWM_SET;