CHAPTER 8 CLOCK GENERATION FUNCTION
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User’s Manual U14492EJ3V0UD
(2) Securing the time according to the signal level width (RESET pin input)
Software STOP mode is released due to falling edge input to the RESET pin.
The time until the clock output from the oscillator stabilizes is secured according to the low level width of the
signal that is input to the pin.
The supply of internal system clocks begins after a rising edge is input to the RESET pin, and processing
branches to the handler address used for a system reset.
Oscillation waveform (X2)
Set software STOP mode
Oscillator is stopped
Internal main clock
STOP state
Internal system
reset signal
Oscillation stabilization
time secured by RESET
RESET
(input)
Undefined
CLKOUT (output)
Undefined
8.6.2 Time base counter (TBC)
The time base counter (TBC) is used to secure the oscillator’s oscillation stabilization time when software STOP
mode is released.
When an external clock is connected (CESEL bit of CKC register = 1) or a resonator is connected (PLL mode and
CESEL bit of CKC register = 0), the TBC counts the oscillation stabilization time after software STOP mode is
released, and program execution begins after the count is completed.
The TBC count clock is selected according to the TBCS bit of the CKC register, and the next counting time can be
set.
Table 8-8. Counting Time Examples (f
XX
= 10
××××
f
X
)
Counting Time
TBCS Bit
Count Clock
f
X
= 4.0000 MHz
f
X
= 5.0000 MHz
0
f
X
/2
8
16.4 ms
13.2 ms
1
f
X
/2
9
32.8 ms
26.3 ms
f
XX
: Internal system clock
f
X
:
External oscillation frequency
Содержание V850E/IA1 mPD703116
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