MK_CSR
chiptime[MK_CSR] |= MK_CSR_READ; /* enable read (stop time) */
chiptime[MK_CSR] &= ~MK_CSR_READ; /* time wears on */
chiptime[MK_CSR] |= MK_CSR_WRITE; /* enable write */
chiptime[MK_CSR] &= ~MK_CSR_WRITE; /* load them up */
mclock[MK_CSR] |= MK_CSR_READ;
mclock[MK_CSR] &= ~MK_CSR_READ;