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Chapter 21
Reset Function
User’s Manual U16580EE3V1UD00
21.3 Operation
When a low-level signal is input to the RESET pin, a system reset is effected and each on-chip
hardware is initialized.
When the RESET pin level changes from low to high, the oscillation stabilization time counter (OSTC) is
started after analog delay by the reset generator. At that time the OSTC elapses, the PLL circuit will be
enabled and the internal PLL stabilization time counter (PSTC) is started using the oscillator output
clock (f
X
). After 2
14
oscillator clocks (f
X
) the PLL output clock becomes the system clock (f
XX
) and the
internal system reset is released synchronously to the system clock.
Figure 21-1:
Reset Timing
Remarks: 1.
If no clock is supplied to V850E/PH2 (i.e. the oscillator does not work) the internal
system reset will not be released independently from input level of the external RESET
pin.
2.
The on-chip debug function can force the activation of the system reset independently
from input level of the RESET pin.
RESET
System reset
System clock (f
)
XX
OSTC
PSTC
X1 (f )
X
PLL
Analog
delay
CPU starts up
Oscillation stabilization time
PLL lock
up time
(2 / f )
14
X
Содержание MuPD70F3187
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Страница 144: ...144 Chapter 3 CPU Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 192: ...192 Chapter 5 Memory Access Control Function μPD70F3187 only User s Manual U16580EE3V1UD00 MEMO ...
Страница 312: ...312 Chapter 9 16 Bit Timer Event Counter P User s Manual U16580EE3V1UD00 MEMO ...
Страница 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00 ...
Страница 969: ...969 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 MEMO ...
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Страница 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO ...
Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO ...
Страница 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO ...
Страница 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO ...
Страница 1046: ...1046 Appendix A Index User s Manual U16580EE3V1UD00 MEMO ...
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