170
Chapter 4
Clock Generator
Preliminary User’s Manual U17566EE1V2UM00
(2)
IDLE mode
The IDLE mode can be entered from any run mode. The main oscillator must
be operating. IDLE mode can not be entered if the CPU is clocked by the sub
or ring oscillator.
In IDLE mode, the clock distribution is stopped (refer to the “Standby” switches
in
Figure 4-1, “Block diagram of the Clock Generator,” on page 130
).
The states of all clock sources, that means, sub and ring oscillator as well as
SSCG and PLL, remain unchanged. If a clock source was operating before
entering IDLE mode, it continues operating.
The IDLE mode can be released by
• the unmasked maskable interrupts INTPn, INTCnWUP, INTWTnUV,
INTTM01, INTVCn, INTCBnR
• NMI0, NMIWDT
• RESET, RESPOC, RESWDT, RESCMM, RESCMS
On IDLE mode release, the CPU clock and peripheral clocks are supplied by
the main oscillator.
Table 4-25
Clock Generator status in IDLE mode
Item
Status
Remarks
Main oscillator
unchanged
Sub oscillator
operates
Ring oscillator
operates
SSCG
unchanged
PLL
unchanged
VBCLK (CPU system)
stopped
IICLK
stopped
PCLK0, PCLK1
stopped
PCLK2…PCLK15
stopped
SPCLK0, SPCLK1
stopped
SPCLK2…SPCLK15
stopped
FOUTCLK
unchanged
WTCLK / LCDCLK
unchanged
WDTCLK
unchanged
WCTCLK
unchanged/stopped
Depends on clock selector
PSM.CMODE
electronic components distributor