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18.7
System Clock Output Disabling Function
Output of the system clock (
φ
) can be controlled by the PSTOP bit in MSTCRH. When the
PSTOP bit is set to 1, output of the system clock halts and the
φ
pin is placed in the high-
impedance state. Figure 18.3 shows the timing of the stopping and starting of system clock output.
When the PSTOP bit is cleared to 0, output of the system clock is enabled. Table 18.4 indicates
the state of the
φ
pin in various operating states.
T1
T2
(PSTOP = 1)
T3
T1
T2
(PSTOP = 0)
MSTCRH write cycle
MSTCRH write cycle
High impedance
φ
pin
T3
Figure 18.3 Starting and Stopping of System Clock Output
Table 18.4
φ
Pin State in Various Operating States
Operating State
PSTOP = 0
PSTOP = 1
Hardware standby
High impedance
High impedance
Software standby
Always high
High impedance
Sleep mode
System clock output
High impedance
Normal operation
System clock output
High impedance
Содержание H8/3008
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