User’s Manual U11969EJ3V0UM00
149
CHAPTER 6 CLOCK GENERATOR FUNCTION
6.6 Specifying Oscillation Stabilization Time
The time required for the oscillator circuit to become stabilized after the STOP mode has been released can be
specified in the following two ways:
(1)
Securing time using internal time base counter (NMI pin input)
When the valid edge is input to the NMI pin, the STOP mode is released. When the inactive edge is input
to the pin, the time base counter (TBC) starts counting, and the time required for the clock output from the
oscillator circuit to become stabilized is specified by that count time.
Oscillation stabilization time
~
(Active level width after valid edge of NMI input has been detected) + (Count
time of TBC)
After a specific time has elapsed, the system clock output is started, and execution branches to the handler
address of the NMI interrupt.
During inactivity, the NMI pin should be kept at the inactive level (e.g. when the valid edge is specified to be
the falling edge).
If an operation to enter the STOP mode is performed while a valid edge has been input to the NMI pin before
the CPU accepts the interrupt, the STOP mode will immediately be released. If the clock generator is driven
by a PLL (CKSEL = 0) and an oscillator (CESEL = 0), program execution is started after the oscillation
stabilization time specified in the time base counter has elapsed.
Oscillation waveform
STOP mode set
Oscillator circuit stops
System clock
STOP status
NMI input
Count time of time
base counter
Содержание V854 UPD703006
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