MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 201

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.1 Functions of A/D Converter
ANI3) with a resolution of 10 bits.
(1) 10-bit resolution A/D conversion
(2) Power-fail detection function
Analog input channel
specification register (ADS)
ANI0/P20
ANI1/P21
ANI2/P22
ANI3/P23
ADTRG
INTADTR
The A/D converter converts an analog input signal into a digital value, and consists of up to four channels (ANI0 to
The A/D converter has the following two functions.
10-bit resolution A/D conversion is carried out repeatedly for one channel selected from analog inputs ANI0 to
ANI3. Each time an A/D conversion operation ends, an interrupt request (INTAD) is generated.
This function is used to detect a voltage drop in a battery. The A/D conversion result (ADCR register value) and
power-fail comparison threshold register (PFT) value are compared.
comparative condition has been matched.
EGA1 EGA0 TRG ADTMD
detector
Edge
ADS2 ADS1 ADS0
Figure 13-1. Block Diagram of A/D Converter
3
CHAPTER 13 A/D CONVERTER
ADCS ADMD FR2
A/D converter mode
register (ADM)
User’s Manual U17890EJ2V0UD
Internal bus
Sample & hold circuit
FR1
AV
SS
FR0 ADHS1ADHS0 ADCS2
Successive approximation
Controller
Voltage comparator
A/D conversion result
register (SAR)
register (ADCR)
INTAD is generated only when a
PFEN PFCM
ADCS bit
Power-fail comparison
mode register (PFM)
Comparator
register (PFT)
comparison
Power-fail
threshold
INTAD
AV
AV
199
REF
SS