ENVY24HT_MT_RCNT
regno = ENVY24HT_MT_RCNT;
regptr = ENVY24HT_MT_RCNT;
ptr = dsize - envy24ht_rdmt(sc, ENVY24HT_MT_RCNT, 2) - 1;
envy24ht_wrmt(sc, ENVY24HT_MT_RCNT, (uint32_t)(segs->ds_len / 4 - 1), 2);