Chapter 4
Clock/ Mode/ Voltage Control
Mode Control Function IV - 15
4.2.1 NORMAL Mode
Transition from SLOW to NORMAL
When the transition from SLOW to NORMAL, the oscillation stabilization wait for HCLK is ensured by hard-
ware. Figure:4.2.2 shows the transition procedure to NORMAL. The transition to NORMAL through IDLE can
be allowed, when HCLK must be stable in IDLE as shown in Figure:4.2.3.
Figure:4.2.2 Transition Flow from SLOW to NORMAL
..
Until entering NORMAL mode since the CPUM is set to transmit to NORMAL mode,
SYSCLK is generated from SCLK.
..
Figure:4.2.3 Transition Flow from SLOW to NORMAL through IDLE
Transition to NORMAL mode
(Set the CPUM as described in Table 4.1.3
SLOW mode
NORMAL mode
Automatic high-speed oscillation
stabilization wait time by hardware
NO(Transition to OSC mode)
YES(Transition to RC mode)
Start the external high-speed oscillatio
HCLKCNT.HOSCCNT = 1
HCLKCNT.HCLKSEL == 0
Internal high-speed oscillation
stabillization wait time
Start the internal high-speed oscillation
HCLKCNT.HRCCNT = 1
SLOW mode
NORMAL mode
Transition to IDLE mode
(Set the CPUM as described in Table 4.1.3.)
Transition ot NORMAL mode
(Set the CPUM as described in Table 4.1.3.)
External high-speed oscillation
stabillization wait time
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