PTR_READ
smc->b2.ptr = PTR_READ; /* point to status word */
smc->b2.ptr = PTR_RCV | PTR_AUTOINCR | PTR_READ | SWAP(0x0002);
smc->b2.ptr = PTR_RCV | (PTR_AUTOINCR + PTR_READ) | SWAP(0x0000);
PTR_READ | PTR_RCV | PTR_AUTOINC /* | 0x0000 */);
PTR_AUTOINC | PTR_READ /* | 0x0000 */);