1 hcr hi receive interrupt enable (hrie)—bit 0, 2 hcr hi transmit interrupt enable (htie)—bit 1, 3 hcr hi command interrupt enable (hcie)—bit 2 – Motorola DSP56012 User Manual

Page 95: 4 hcr hi flag 2 (hf2)—bit 3, 5 hcr hi flag 3 (hf3)—bit 4, Hcr hi command interrupt enable (hcie)—bit 2 4-15, Hcr hi flag 2 (hf2)—bit 3 -15, Hcr hi flag 3 (hf3)—bit 4 -15, Isr transmitter ready (trdy)—bit 2 -31