![NXP Semiconductors MPC5605BK Скачать руководство пользователя страница 727](http://html.mh-extra.com/html/nxp-semiconductors/mpc5605bk/mpc5605bk_reference-manual_1721852727.webp)
Chapter 28 Analog-to-Digital Converter (ADC)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
725
28.3.4
ADC CTU (Cross Triggering Unit)
28.3.4.1
Overview
The ADC cross triggering unit (CTU) is added to enhance the injected conversion capability of the ADC.
The CTU is triggered by multiple input events (eMIOS and PIT) and can be used to select the channels to
be converted from the appropriate event configuration register. A single channel is converted for each
request.
The CTU can be enabled by setting MCR[CTUEN].
The CTU and the ADC are synchronous with the peripheral set 3 clock in both cases.
28.3.4.2
CTU in trigger mode
In CTU trigger mode, normal and injected conversions triggered by the CPU are still enabled.
Once the CTU event configuration register (CTU_EVTCFGR
x
) is configured and the corresponding
trigger from the eMIOS or PIT is received, the conversion starts. The MSR[CTUSTART] is set
automatically at this point and it is also automatically reset when the CTU triggered conversion is
completed.
If an injected conversion (programmed by the user by setting the JSTART bit) is ongoing and CTU
conversion is triggered, then the injected channel conversion chain is aborted and only the CTU triggered
conversion proceeds. By aborting the injected conversion, the MSR[JSTART] is reset. That abort is
signaled through the status bit MSR[JABORT].
If a normal conversion is ongoing and a CTU conversion is triggered, then any ongoing channel conversion
is aborted and the CTU triggered conversion is processed. When it is finished, the normal conversion
resumes from the channel at which the normal conversion was aborted.
If another CTU conversion is triggered before the end of the current CTU triggered conversion, the new
request is discarded.
When a normal conversion is requested during CTU conversion (CTUSTART bit = 1), the normal
conversion starts when CTU conversion is completed (CTUSTART = 0). Otherwise, when an Injected
conversion is requested during CTU conversion, the injected conversion is discarded and the
MCR[JSTART] is immediately reset.
28.3.5
Presampling
28.3.5.1
Introduction
Presampling is used to precharge or discharge the ADC internal capacitor before it starts sampling of the
analog input coming from the input pins. This is useful for resetting information regarding the last
converted data or to have more accurate control of conversion speed. During presampling, the ADC
samples the internally generated voltage.
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...