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Clock switching

All microcomputers operate with clocks as references. The clock generated with the oscillator is multiplied or divided to make the clock for command execution, and the clock for a built-in peripheral circuit. 
It shows that clock frequency supplied to built-in peripheral circuits is switched, and gives a demonstration to show instruction execution rates. 
For the simulation, the default settings are (1) built-in oscillation frequency: 10.0 MHz, (2) low speed oscillation frequency: 32.768 kHz.

Setting relevant to the clock

Setting method

  • (1), (2), and (3) show how to select a high-speed oscillator and how to set PLL multiplication. 
    There are some combinations of oscillating frequency of the high-speed oscillator and the possible values of PLL multiplication. Select a combination with the pull-down menu.
  • (4) PLL selection 
    Select a frequency from the following: 8-16 MHz of the built-in oscillator or the high-speed oscillator as is (fosc use), or 48-80 MHz multiplied by PLL circuit (fpll use). The selected frequency is fc.
  • (5) Clock gear selection 
    The fc is divided into 1/2, 1/4, 1/8, and 1/16. The divided frequency is fgear, which is the clock fsys for command execution.
  • (6) fperiph selection 
    Select a clock supplied to the built-in peripheral circuit. You can select from fgear and fc.
  • (7) Prescaler clock selection 
    Decide the clock ΦT0 supplied to the built-in peripheral circuit. Select from the range of fperiph to fperiph/32.
  • (8)SCOUT output selection 
    Select the frequency to output to the SCOUT pin as the system clock.
No. Term Setting Register Signal Frequency
(1) High-speed clock frequency
PLL multiplication has combinations.
       
(2) High-speed oscillator CGOSCCR<OSCSEL> fosc MHz
(3) PLL setting CGPLLSEL<PLLSET> fpll MHz
(4) PLL use CGPLLSEL<PLLSEL> fc MHz
(5) Clock gear CGSYSCR<GEAR> fgear MHz
fsys MHz
(6) fperiph CGSYSCR<FPSEL> fperiph MHz
(7) Pre-scaler CGSYSCR<PRCK> ΦT0 MHz
(8) SCOUT output CGSYSCR<SCOSEL> SCOUT MHz

The image of the command execution speed and the clock system diagram

command execution(fsys)
command execution(fsys)
command execution(fsys)
command execution(fsys)
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