Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 15 A/D CONVERTER
R01UH0042EJ0500 Rev.5.00 Page 679 of 1513
Aug 12, 2011
CHAPTER 15 A/D CONVERTER
15.1 Overview
The A/D converter converts analog input signals into digital values, has a resolution of 10 bits, and can handle 12
analog input signal channels (ANI0 to ANI11).
The A/D converter has the following features.
{ 10-bit resolution
{ 12 channels
{ Successive approximation method
{ Operating voltage: AV
REF0 = 3.0 to 3.6 V
{ Analog input voltage: 0 V to AVREF0
{ The following functions are provided as operation modes.
• Continuous select mode
• Continuous scan mode
• One-shot select mode
• One-shot scan mode
{ The following functions are provided as trigger modes.
• Software trigger mode
• External trigger mode (external, 1)
• Timer trigger mode
{ Power-fail monitor function (conversion result compare function)
15.2 Functions
(1) 10-bit resolution A/D conversion
An analog input channel is selected from ANI0 to ANI11, and an A/D conversion operation is repeated at a
resolution of 10 bits. Each time A/D conversion has been completed, an interrupt request signal (INTAD) is
generated.
(2) Power-fail detection function
This function is used to detect a drop in the battery voltage. The result of A/D conversion (the value of the
ADA0CRnH register) is compared with the value of the ADA0PFT register, and the INTAD signal is generated only
when a specified comparison condition is satisfied (n = 0 to 11).