![NXP Semiconductors MPC5605BK Скачать руководство пользователя страница 125](http://html.mh-extra.com/html/nxp-semiconductors/mpc5605bk/mpc5605bk_reference-manual_1721852125.webp)
Chapter 6 Clock Description
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
125
•
FIRC_clk: clock coming from the fast (high frequency) internal RC oscillator
•
FMPLL_clk: clock coming from the FMPLL
•
f
FXOSC_clk:
frequency of fast external crystal oscillator clock
•
f
SXOSC_clk
: frequency of slow external crystal oscillator clock
•
f
SIRC_clk
: frequency of slow (low frequency) internal RC oscillator
•
f
FIRC_clk
: frequency of fast (high frequency) internal RC oscillator
•
f
FMPLL_clk
: frequency of FMPLL clock
6.8.4.1
Crystal clock monitor
If f
FXOSC_clk
is less than f
FIRC_clk
divided by
2
RCDIV
bits of the CMU_CSR and the FXOSC_clk is ON as
signaled by the MC_ME, then:
•
An event pending bit OLRI in CMU_ISR is set.
•
A failure event OLR is signaled to the MC_RGM, which in turn can automatically switch to a safe
fallback clock and generate an interrupt or reset.
NOTE
Functional FXOSC monitoring can only be guaranteed when the FXOSC
frequency is greater than (FIRC / 2
RCDIV
) + 0.5 MHz.
6.8.4.2
FMPLL clock monitor
The f
FMPLL_clk
can be monitored by programming bit CME of the CMU_CSR register to 1. The
FMPLL_clk monitor starts as soon as bit CME is set. This monitor can be disabled at any time by writing
bit CME to 0.
If f
FMPLL_clk
is greater than a reference value determined by bits HFREF[11:0] of the CMU_HFREFR and
the FMPLL_clk is ON, as signaled by the MC_ME, then:
•
An event pending bit FHHI in CMU_ISR is set.
•
A failure event is signaled to the MC_RGM, which in turn can generate an interrupt or safe mode
request or functional reset, depending on the programming model.
If f
FMPLL_clk
is less than a reference value determined by bits LFREF[11:0] of the CMU_LFREFR and the
FMPLL_clk is ON, as signaled by the MC_ME, then:
•
An event pending bit FLLI in CMU_ISR is set.
•
A failure event FLL is signaled to the MC_RGM, which in turn can generate an interrupt or safe
mode request or functional reset, depending on the programming model.
NOTE
Functional FMPLL monitoring can only be guaranteed when the FMPLL
frequency is greater than (FIRC / 4) + 0.5 MHz.
Содержание MPC5605BK
Страница 2: ...This page is intentionally left blank...
Страница 20: ...MPC5606BK Microcontroller Reference Manual Rev 2 20 Freescale Semiconductor...
Страница 103: ...MPC5606BK Microcontroller Reference Manual Rev 2 Freescale Semiconductor 103 Clocks and power...
Страница 104: ...MPC5606BK Microcontroller Reference Manual Rev 2 104 Freescale Semiconductor This page is intentionally left blank...
Страница 243: ...MPC5606BK Microcontroller Reference Manual Rev 2 Freescale Semiconductor 243 Core platform modules...
Страница 244: ...MPC5606BK Microcontroller Reference Manual Rev 2 244 Freescale Semiconductor This page is intentionally left blank...
Страница 395: ...MPC5606BK Microcontroller Reference Manual Rev 2 Freescale Semiconductor 395 Communication modules...
Страница 396: ...MPC5606BK Microcontroller Reference Manual Rev 2 396 Freescale Semiconductor This page is intentionally left blank...
Страница 548: ...Chapter 24 LIN Controller LINFlexD MPC5606BK Microcontroller Reference Manual Rev 2 548 Freescale Semiconductor...
Страница 645: ...MPC5606BK Microcontroller Reference Manual Rev 2 Freescale Semiconductor 643 Timers...
Страница 646: ...MPC5606BK Microcontroller Reference Manual Rev 2 644 Freescale Semiconductor This page is intentionally left blank...
Страница 715: ...MPC5606BK Microcontroller Reference Manual Rev 2 Freescale Semiconductor 713 ADC system...
Страница 716: ...MPC5606BK Microcontroller Reference Manual Rev 2 714 Freescale Semiconductor This page is intentionally left blank...
Страница 787: ...MPC5606BK Microcontroller Reference Manual Rev 2 Freescale Semiconductor 787 Memory...
Страница 788: ...MPC5606BK Microcontroller Reference Manual Rev 2 788 Freescale Semiconductor This page is intentionally left blank...
Страница 893: ...MPC5606BK Microcontroller Reference Manual Rev 2 Freescale Semiconductor 893 Integrity...
Страница 894: ...MPC5606BK Microcontroller Reference Manual Rev 2 894 Freescale Semiconductor This page is intentionally left blank...
Страница 943: ...MPC5606BK Microcontroller Reference Manual Rev 2 Freescale Semiconductor 943 Debug...
Страница 944: ...MPC5606BK Microcontroller Reference Manual Rev 2 944 Freescale Semiconductor This page is intentionally left blank...