S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V8)
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors
161
4.5.2
Description of Reset Operation
Upon detection of any reset of
, an internal circuit drives the RESET pin low for 512 PLLCLK
cycles. After 512 PLLCLK cycles the RESET pin is released. The reset generator of the
S12CPMU_UHV_V8 waits for additional 256PLLCLK cycles and then samples the RESET pin to
determine the originating source.
shows which vector will be fetched.
NOTE
While System Reset is asserted the PLLCLK runs with the frequency
f
VCORST
.
PLL Clock Monitor Reset
None
Oscillator Clock Monitor Reset
OSCE=1 in CPMUOSC register and
OMRE=1 in CPMUOSC2 register
COP Reset
CR[2:0] in CPMUCOP register
Table 4-32. Reset Vector Selection
Sampled RESET Pin
(256 cycles after
release)
Oscillator monitor
fail pending
COP
time-out
pending
Vector Fetch
1
0
0
POR
LVR
Illegal Address Reset
PLL Clock Monitor Reset
External pin RESET
1
1
X
Oscillator Clock Monitor Reset
1
0
1
COP Reset
0
X
X
POR
LVR
Illegal Address Reset
PLL Clock Monitor Reset
External pin RESET
Table 4-31. Reset Summary
Reset Source
Local Enable
Содержание MC9S12VRP64
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Страница 529: ...MC9S12VRP Family Reference Manual Rev 1 3 NXP Semiconductors 529 Appendix J Package Information ...
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