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MB86R02 ‘Jade-D’ Hardware Manual V1.64
Clock gear
The CRG unit supports 'clock gear' functionality (clock subdivision) with a clock enable signal.
CCLK
ARAMDM
ARMACLKEN
ARMACLK
HADM
HACLKEN
HACLK
n
000
001
001
010
PADM
PACLKEN
PACLK
n
010
Figure 5-11 Clock gear
Standby mode (standby and stop)
The ARM9 core and the CRG module support the following standby modes:
(1) Standby mode
The ARM926EJ-S core supports a standby mode that is called "Interrupt waiting
mode" with CP15. The STANDBYWFI signal is asserted and the internal clock
gate is closed so that it does not supply an input clock to submodules in standby
mode (refer to ARM926EJ-S technical reference manual, "12.1.1 dynamic
power management (interrupt mode waiting)".)
This CRG module does not have a function to stop the ARMCLK signal in
standby mode.
ARMCLK
Clock
Reset
Generator
ARM926EJ-S
CLK
clock
gate
STANDBYWFI
Internal clock
Figure 5-12 STANDBYWFI mode (ARM926EJ-S)
(2) STOP mode
When the STANDBYWFI (ARM926EJ-S) signal is set to "1" when STOPEN = 1,
the state changes to STOP mode through the standby mode (if STOPEN = 1,
this module’s STANDBYWFI signal is "1".)
In this mode, the CRG stops all clocks and the PLL oscillator. Also, the stop
mode is released with an external rest or external interrupt.
The figure shows the STOP mode operation.
Note:
When the state is changed to the STOP mode, "1" should be written to the
PLLBYPASS bit of the PLL control register (CRPR).
Although the PLL proceeds with the oscillation stabilization waiting period when
STOP mode is released, the clock is not switched to PLL clock until the
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