NEC 78K0R/KE3 User Manual page 324

16-bit single-chip microcontrollers

Table of Contents

<Obtaining temperature T

<14> Calculate the temperature by using either of the following methods.

• When obtaining a temperature through calculation

During measurement at reference temperatures, write ADT0 and ADT1 to the internal flash memory

by means such as self programming. During actual measurement, calculate the current temperature

by using the following expression, based on ADT0 and ADT1 at that time.

• When obtaining a temperature through table reference

Measure and calculate the temperature sensor detection values (ADT0/ADT1 × 256) based on ADT0

and ADT1 at each temperature interval. Set the temperature corresponding to that value as table

data, and write it to the internal flash memory by means such as self programming.

During actual measurement, calculate the temperature sensor detection value (ADT0/ADT1 × 256)

based on ADT0 and ADT1 at that time, compare it with the value of table data, and obtain the current

temperature T

<15> Clear ADCS to 0.

<16> Clear ADCE to 0.

<17> Clear bit 5 (ADCEN) of peripheral enable register 0 (PER0) to 0.

Cautions 1. Make sure the period of <2> to <5> is 1

2. <2> can be done between <3> and <4>.

3. The period from <7> to <10> differs from the conversion time set using bits 5 to 1

4. Do not change the AV

CHAPTER 10 A/D CONVERTER

the result of the third and later conversion becomes valid on the sensor 0 side.

(FR2 to FR0, LV1, LV0) of ADM. The period from <9> to <10> is the conversion time

set using FR2 to FR0, LV1, and LV0.

sensor detection value does not depend on the AV

problem even if the AV

must be stable during a measurement cycle (from <4> to <13>).

User's Manual U17854EJ9V0UD

s or more. If ADCS is set to 1 within 1

voltage during <4> to <13>. Although the temperature

voltage varies at every temperature measurement, it

voltage and thus there is no