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9.9.1.2 Alternate clock
The ADC module is capable of performing conversions using the MCU bus clock, the
bus clock divided by two, the local asynchronous clock (ADACK) within the module, or
the alternate clock, ALTCLK. The alternate clock for the devices is the external oscillator
output (OSCOUT).
The selected clock source must run at a frequency such that the ADC conversion clock
(ADCK) runs at a frequency within its specified range (f
ADCK
) after being divided down
from the ALTCLK input as determined by the ADIV bits.
ALTCLK is active while the MCU is in wait mode provided the conditions described
above are met. This allows ALTCLK to be used as the conversion clock source for the
ADC while the MCU is in wait mode.
ALTCLK cannot be used as the ADC conversion clock source while the MCU is in stop3
mode.
9.9.1.3 Hardware trigger
The ADC hardware trigger is selectable from RTC overflow , the ACMP output, the
FTM output. The MCU can be configured to use any of those four hardware trigger
sources in run and wait modes. The RTC overflow can be used as ADC hardware trigger
in STOP3 mode. Please refer to
.
9.9.1.4 Temperature sensor
The ADC module integrates an on-chip temperature sensor. Following actions must be
performed to use this temperature sensor.
• Configure ADC for long sample with a maximum of 1 MHz clock
• Convert the bandgap voltage reference channel (AD23)
• By converting the digital value of the bandgap voltage reference channel using
the value of V
BG
the user can determine V
DD
.
• Convert the temperature sensor channel (AD22)
• By using the calculated value of V
DD
, convert the digital value of AD22 into a
voltage, V
TEMP
Analog
MC9S08PA4 Reference Manual, Rev. 5, 08/2017
190
NXP Semiconductors
Содержание MC9S08PA4
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Страница 28: ...System clock distribution MC9S08PA4 Reference Manual Rev 5 08 2017 28 NXP Semiconductors ...
Страница 150: ...Port data registers MC9S08PA4 Reference Manual Rev 5 08 2017 150 NXP Semiconductors ...
Страница 196: ...Human machine interfaces HMI MC9S08PA4 Reference Manual Rev 5 08 2017 196 NXP Semiconductors ...
Страница 224: ...Instruction Set Summary MC9S08PA4 Reference Manual Rev 5 08 2017 224 NXP Semiconductors ...
Страница 232: ...Functional Description MC9S08PA4 Reference Manual Rev 5 08 2017 232 NXP Semiconductors ...
Страница 258: ...FTM Interrupts MC9S08PA4 Reference Manual Rev 5 08 2017 258 NXP Semiconductors ...
Страница 268: ...Initialization application information MC9S08PA4 Reference Manual Rev 5 08 2017 268 NXP Semiconductors ...
Страница 294: ...Functional description MC9S08PA4 Reference Manual Rev 5 08 2017 294 NXP Semiconductors ...
Страница 370: ...Memory map and register description MC9S08PA4 Reference Manual Rev 5 08 2017 370 NXP Semiconductors ...
Страница 398: ...Resets MC9S08PA4 Reference Manual Rev 5 08 2017 398 NXP Semiconductors ...
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