Fujitsu FR60 Hardware Manual page 150

32-bit microcontroller mb91301 series

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CHAPTER 3 CPU AND CONTROL UNITS

❍ Procedure of shut down

#macro wait_loop loop_number

#local _wait64_loop

_wait64_loop:

smooth_down_start3:

//Increase the divide-by rate of CLKT gradually.

//Increase the divide-by rate of CLKB and CLKP gradually.

//Reduce the multiply-by rate of the PLL gradually.

#loop_number,r0

bne _wait64_loop

// No CLKT division → 2

wait_loop 16

// Divide CLKT by 2 → 4

// Divide CLKT by 4 → 16

// No CLKB division → by 2, divide CLKP by 2 → 2

wait_loop 16

// Divide CLKB and CLKP by 2 → 4

//Divide CLKB and CLKP by 4 → 16

// Change from the PLL to the source oscillation of the X0/X1.

// Division register for CLKB and CLKP

// Division register for CLKT

// CLKR register