MMCR1_TTM0SEL_SH
mmcr1 |= (unsigned long)i << MMCR1_TTM0SEL_SH;
mmcr1 |= (unsigned long)i << MMCR1_TTM0SEL_SH;
#define MMCR1_TTMSEL_SH(n) (MMCR1_TTM0SEL_SH - (n) * 4)
<< (MMCR1_TTM0SEL_SH - 4 * pmc);