This mode needs some trigger events to work. The trigger events include the operation
clock and a trigger start signal which can be provided by other module (e.g. LPTMR).
Round robin mode works as follows:
1. The trigger start signal will enable the comparator and internal DAC in the
initialization delay period;
2. The comparator will then compare the multiple input channels with the reference
input channel in turn under the operation clock until all input channels complete
comparison;
3. If current comparison result is different with the pre-set state or the previous
comparison result and round robin interrupt is enabled, an interrupt will generate to
bring the MCU out of STOP mode.
Round robin clock
MCU STOP
Trigger event
Round robin start
Enable Comparator /
Internal DAC
Input channel state
Sample channels
comparison result
Channels result
Channel 1
Channel 1/2
Channel 1
Channel 2
Channel 3
Channel 1/2/3
Initialization delay
Possible interrupt
MCU Wake Up
Detect comparison result changing
The code snippet to enable the round robin mode is:
/* Set the positive port input from DAC and negative port input from minus mux input */
/* Plus mux input must be different from minus mux input even though they aren't functional
in round robin mode. */
CMPx_C1 = ((CMPx_C1 & (~(CMP_C1_INPSEL_MASK | CMP_C1_INNSEL_MASK | CMP_C1_PSEL_MASK |
CMP_C1_MSEL_MASK)))
| (CMP_C1_INPSEL(0) | CMP_C1_INNSEL(1) | CMP_C1_PSEL(0) | CMP_C1_MSEL(1)));
/* Set following round robin attribute:
positive port as fixed port.
All channel0~7 as the round robin checker channel in non-fixed port.
The comparison result is sampled as soon as the active channel is scanned in one round-robin
clock.
The initialization delay modulus is set to 64.
Enable round robin mode.
Chapter 38 Comparator (CMP)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
905
Содержание KE1xF Series
Страница 2: ...Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 2 NXP Semiconductors...
Страница 60: ...SysTick Clock Configuration Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 60 NXP Semiconductors...
Страница 114: ...Initialization application information Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 114 NXP Semiconductors...
Страница 138: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 138 NXP Semiconductors...
Страница 320: ...Private Peripheral Bus PPB memory map Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 320 NXP Semiconductors...
Страница 342: ...Functional Description Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 342 NXP Semiconductors...
Страница 360: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 360 NXP Semiconductors...
Страница 490: ...Interrupts Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 490 NXP Semiconductors...
Страница 550: ...Memory map and register definition Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 550 NXP Semiconductors...
Страница 562: ...Boot Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 562 NXP Semiconductors...
Страница 662: ...Power supply supervisor Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 662 NXP Semiconductors...
Страница 694: ...On chip resource access control mechanism Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 694 NXP Semiconductors...
Страница 706: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 706 NXP Semiconductors...
Страница 724: ...Application Information Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 724 NXP Semiconductors...
Страница 736: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 736 NXP Semiconductors...
Страница 750: ...Debug and Security Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 750 NXP Semiconductors...
Страница 798: ...Functional description Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 798 NXP Semiconductors...
Страница 808: ...Functional description Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 808 NXP Semiconductors...
Страница 866: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 866 NXP Semiconductors...
Страница 1164: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1164 NXP Semiconductors...
Страница 1178: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1178 NXP Semiconductors...
Страница 1380: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1380 NXP Semiconductors...
Страница 1472: ...Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1472 NXP Semiconductors...
Страница 1482: ...Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1482 NXP Semiconductors...