CHAPTER 9 CLOCK GENERATION FUNCTION
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User’s Manual U14359EJ4V0UM
Figure 9-1 shows the operation of the clock generator in normal operation mode, HALT mode, IDLE mode, and
software STOP mode.
An effective low power consumption system can be realized by combining these modes and switching modes
according to the required use.
Figure 9-1. Power-Save Mode State Transition Diagram
Normal operation mode
Software STOP mode
Set STOP mode
IDLE mode
Set IDLE mode
Release according to RESET,
NMI, or maskable interrupt
Note
Set HALT mode
Release according to RESET,
NMI, or maskable interrupt
HALT mode
Release according to RESET,
NMI, or maskable interrupt
Note
Note
INTP1nn (n = 0 to 3)
When level detection is specified for the INTP1nn pin, software STOP mode and IDLE mode cannot
be released.
Table 9-1. Clock Generator Operation Using Power-Save Control
Clock Source
Power-Save Mode
Oscillator
PLL
Synthesizer
Clock Supply
to Peripheral
I/O
Clock Supply
to CPU
Normal operation
√
√
√
√
HALT mode
√
√
√
−
IDLE mode
√
√
−
−
Oscillation with
resonator
Software STOP mode
−
−
−
−
Normal operation
−
√
√
√
HALT mode
−
√
√
−
IDLE mode
−
√
−
−
PLL mode
External clock
Software STOP mode
−
−
−
−
Normal operation
−
−
√
√
HALT mode
−
−
√
−
IDLE mode
−
−
−
−
Direct mode
External clock
Software STOP mode
−
−
−
−
Remark
√
: Operating
−
: Stopped