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7.5.1 Main system clock operations
When operated with the main system clock (with bit 5 (CLS) of the processor clock control register (PCC) set to
0), the following operations are carried out by PCC setting.
(a) Because the operation guarantee instruction execution speed depends on the power supply voltage, the
(b) If bit 7 (MCC) of the PCC is set to 1 when operated with the main system clock, the main system clock
(a) Operation when MCC is set after setting CSS with main system clock operation
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Main System Clock
Subsystem Clock
minimum instruction execution time can be changed by bits 0 to 2 (PCC0 to PCC2) of the PCC.
oscillation does not stop. When bit 4 (CSS) of the PCC is set to 1 and the operation is switched to subsystem
clock operation (CLS = 1) after that, the main system clock oscillation stops (see Figure 7-7).
Figure 7-7. Main System Clock Stop Function (1/2)
MCC
CSS
CLS
Oscillation
Oscillation
CPU Clock
CHAPTER 7 CLOCK GENERATOR
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