mc9s12q128 Freescale Semiconductor, Inc, mc9s12q128 Datasheet - Page 281
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mc9s12q128
Manufacturer Part Number
mc9s12q128
Description
Hcs12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12Q128.pdf
(644 pages)
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Freescale Semiconductor
CME
0
1
1
SCME
X
0
1
SCMIE
X
X
0
Clock failure -->
Clock failure -->
Clock Monitor failure -->
Scenario 1: OSCCLK recovers prior to exiting Pseudo-Stop Mode.
Scenario 2: OSCCLK does not recover prior to exiting Pseudo-Stop Mode.
Table 9-12. Outcome of Clock Loss in Pseudo-Stop Mode
No action, clock loss not detected.
CRG performs Clock Monitor Reset immediately
– MCU remains in Pseudo-Stop Mode,
– VREG enabled,
– PLL enabled,
– SCM activated,
– Start Clock Quality Check,
– Set SCMIF interrupt flag.
Some time later OSCCLK recovers.
– CM no longer indicates a failure,
– 4096 OSCCLK cycles later Clock Quality Check indicates clock o.k.,
– SCM deactivated,
– PLL disabled,
– VREG disabled.
– MCU remains in Pseudo-Stop Mode.
Some time later either a wakeup interrupt occurs (no SCM interrupt)
– Exit Pseudo-Stop Mode using OSCCLK as system clock (SYSCLK),
– Continue normal operation.
– Exit Pseudo-Stop Mode using OSCCLK as system clock,
– Start reset sequence.
– MCU remains in Pseudo-Stop Mode,
– VREG enabled,
– PLL enabled,
– SCM activated,
– Start Clock Quality Check,
– Set SCMIF interrupt flag,
– Keep performing Clock Quality Checks (could continue infinitely)
Some time later either a wakeup interrupt occurs (no SCM interrupt)
– Exit Pseudo-Stop Mode in SCM using PLL clock (f
– Continue to perform additional Clock Quality Checks until OSCCLK
or an External RESET is applied.
– Exit Pseudo-Stop Mode in SCM using PLL clock (f
– Start reset sequence,
– Continue to perform additional Clock Quality Checks until OSCCLK
or an External Reset is applied.
is o.k. again.
is o.k.again.
while in Pseudo-Stop Mode.
MC9S12Q128
Rev 1.09
Chapter 9 Clocks and Reset Generator (CRGV4) Block Description
CRG Actions
SCM
SCM
) as system clock
) as system clock
281
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