Mcu Wait Mode Operation; Mcu Normal Stop Mode Operation - NXP Semiconductors MKL27Z128VFM4 Reference Manual

Table of Contents

Chapter 23 Analog-to-Digital Converter (ADC)

In application code, the user reads the temperature sensor channel, calculates V

compares to V

is greater than V

the cold slope value is applied in

the preceding equation. If V

is less than V

, the hot slope value is applied in

the preceding equation. ADC Electricals table may only specify one temperature sensor

slope value. In that case, the user could use the same slope for the calculation across the

operational temperature range.

For more information on using the temperature sensor, see the application note titled

Temperature Sensor for the HCS08 Microcontroller Family (document AN3031).

23.5.9 MCU wait mode operation

Wait mode is a lower-power consumption Standby mode from which recovery is fast

because the clock sources remain active.

If a conversion is in progress when the MCU enters Wait mode, it continues until

completion. Conversions can be initiated while the MCU is in Wait mode by means of

the hardware trigger or if continuous conversions are enabled.

The bus clock, bus clock divided by two; and ADACK are available as conversion clock

sources while in Wait mode. The use of ALTCLK as the conversion clock source in Wait

is dependent on the definition of ALTCLK for this MCU. See the Chip Configuration

information on ALTCLK specific to this MCU.

If the compare and hardware averaging functions are disabled, a conversion complete

event sets SC1n[COCO] and generates an ADC interrupt to wake the MCU from Wait

mode if the respective ADC interrupt is enabled, that is, when SC1n[AIEN]=1. If the

hardware averaging function is enabled, SC1n[COCO] will set, and generate an interrupt

if enabled, when the selected number of conversions are completed. If the compare

function is enabled, SC1n[COCO] will set, and generate an interrupt if enabled, only if

the compare conditions are met. If a single conversion is selected and the compare trigger

is not met, the ADC will return to its idle state and cannot wake the MCU from Wait

mode unless a new conversion is initiated by the hardware trigger.

Stop mode is a low-power consumption Standby mode during which most or all clock

sources on the MCU are disabled.

KL27 Sub-Family Reference Manual , Rev. 5, 01/2016

Freescale Semiconductor, Inc.