set mckr_val [expr {$mckr_val | $::AT91_PMC_PRES_1}]
set mckr_val [expr {$mckr_val | $::AT91SAM9_PMC_MDIV_2}]
set mckr_val [expr {$mckr_val | $::AT91_PMC_PDIV_1}]
mww $::AT91_PMC_MCKR $mckr_val ;# PMC_MCKR (MCLK: 0x102 - (CLK/2)MHZ, 0x202 - (CLK/3)MHz)
set mckr_val [expr {$mckr_val | $::AT91_PMC_PRES_1}]
set mckr_val [expr {$mckr_val | $::AT91SAM9_PMC_MDIV_2}]
set mckr_val [expr {$mckr_val | $::AT91_PMC_PDIV_1}]
mww $::AT91_PMC_MCKR $mckr_val ;# PMC_MCKR (MCLK: 0x102 - (CLK/2)MHZ, 0x202 - (CLK/3)MHz)