OSC32_CR field descriptions
Field
Description
7
ROSCEN
RTC 32k Oscillator (OSC32) module enable
This bit is used to enable the RTC 32k VLP Oscillator (OSC32) module.
NOTE: It is necessary to set this bit even when the external 32k clock mode (ROSCEREFS=0) is in
use.
NOTE: If RTC_CR[OSCE] is set, this bit will be bypassed. OSC32 then works in crystal mode.
0
OSC32 module is disabled.
1
OSC32 module is enabled.
6
ROSCSTPEN
RTC 32k Oscillator stop mode enable
This bit is used to enable the RTC 32k VLP Oscillator in stop mode together with ROSCEN bitfield.
0
Oscillator is disabled regardless the state of ROSCEN.
1
Oscillator is enabled in Stop mode when ROSCEN is set.
5
ROSCSTB
RTC 32k Oscillator stable flag
This flag indicates when using the crystal mode if the oscillator has started up stably after 4096 cycles.
0
RTC 32k oscillator is unstable now and no clock will go out of the block.
1
RTC 32k oscillator is stable.
4
ROSCEREFS
RTC 32k Oscillator external reference clcok selection
NOTE: If RTC_CR[OSCE] is set, this bit will be bypassed. OSC32 then works in crystal mode.
0
Bypass mode. RTC oscillator selects the external 32k clock.
1
Crystal mode.
3–1
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
0
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
19.5 Functional Description
, the module includes an amplifier which supplies the negative
resistor for the RTC oscillator. The gain of the amplifier is controlled by the amplitude
detector, which optimizes the power consumption. A schmitt trigger is used to translate
the sine-wave generated by this oscillator to a pulse clock out, which is a reference clock
for the RTC digital core.
The oscillator includes an internal feedback resistor of approximately 100 MΩ between
EXTAL32 and XTAL32.
Functional Description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
408
NXP Semiconductors
Содержание Kinetis KE1xZ256
Страница 2: ...Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 2 NXP Semiconductors...
Страница 56: ...SysTick Clock Configuration Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 56 NXP Semiconductors...
Страница 62: ...Interrupt channel assignments Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 62 NXP Semiconductors...
Страница 124: ...Application information Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 124 NXP Semiconductors...
Страница 130: ...Initialization application information Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 130 NXP Semiconductors...
Страница 178: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 178 NXP Semiconductors...
Страница 356: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 356 NXP Semiconductors...
Страница 368: ...Module clocks Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 368 NXP Semiconductors...
Страница 410: ...Interrupts Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 410 NXP Semiconductors...
Страница 562: ...Power supply supervisor Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 562 NXP Semiconductors...
Страница 592: ...General security features Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 592 NXP Semiconductors...
Страница 604: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 604 NXP Semiconductors...
Страница 622: ...Application Information Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 622 NXP Semiconductors...
Страница 634: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 634 NXP Semiconductors...
Страница 674: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 674 NXP Semiconductors...
Страница 690: ...Module Signal Description Tables Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 690 NXP Semiconductors...
Страница 712: ...Functional description Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 712 NXP Semiconductors...
Страница 820: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 820 NXP Semiconductors...
Страница 1030: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 1030 NXP Semiconductors...
Страница 1052: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 1052 NXP Semiconductors...
Страница 1066: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 1066 NXP Semiconductors...
Страница 1268: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 1268 NXP Semiconductors...
Страница 1314: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 1314 NXP Semiconductors...
Страница 1316: ...Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 1316 NXP Semiconductors...