NEC UPD703116 User Manual page 644

32-bit single-chip microcontrollers

Table of Contents

Trigger source switching

circuit in timer trigger mode

(Figure 13-2)

ADSCMn0 (16)

: Internal system clock

Cautions 1. Noise at an analog input pin (ANI0n, ANI1n) or reference voltage input pin (AV

give rise to an invalid conversion result.

Software processing is needed in order to prevent this invalid conversion result from

adversely affecting the system.

The following are examples of software processing.

• Use the average value of the results of multiple A/D conversions as the A/D conversion

• Perform A/D conversion multiple consecutive times and use conversion results with the

exception of any abnormal conversion results that are obtained.

• If an A/D conversion result from which it is judged that an abnormality occurred in the

system is obtained, do not perform abnormality processing at once but perform it upon

reconfirming the occurrence of an abnormality.

2. Be sure that voltages outside the range [AV

being used as A/D converter 0 and 1 input pins.

CHAPTER 13 A/D CONVERTER

Figure 13-1. Block Diagram of A/D Converter 0 or 1

hold circuit

ADSCMn1 (16)

Internal bus

User's Manual U14492EJ5V0UD

] are not applied to pins