r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 738

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 17 A/D Converter (ADC)
17.7.5
To prevent damage due to an abnormal voltage, such as an excessive surge at the analog input pins
(AN0 to AN15) and analog reference power supply (AV
connected between the AVcc and AVss, as shown in figure 17.9. Also, the bypass capacitors
connected to AV
AVss. If a filter capacitor is connected as shown in figure 17.9, the input currents at the analog
input pin (ANn) are averaged, and an error may occur. Careful consideration is therefore required
when deciding the circuit constants.
17.7.6
• Set the ADST bit in the A/D control register (ADCR) after the A/D start trigger select register
• Do not start the A/D conversion when the ANS bits (ANS[7:0]) in the A/D analog input
Rev. 1.00 Sep. 21, 2007 Page 712 of 1124
REJ09B0402-0100
(ADSTRGR) and the A/D analog input channel select register (ADANSR) have been set. Do
not modify the settings of the ADCS, ACE, ADIE, TRGE, and EXTRG bits while the ADST
bit in the ADCR register is set to 1.
channel select register (ADANSR) are all 0.
Analog input pin
Analog input pin
4.5 V to 5.5 V
0.0 V
Notes on Noise Countermeasures
Notes on Register Setting
refh
Figure 17.9 Example of Analog Input Pin Protection Circuit
and AV
10 µF
refl
and the filter capacitor connected to ANn should be connected to the
3 kΩ
3 kΩ
0.1 µF
0.1 µF
0.1 µF
0.1 µF
refh
, AV
AVcc
AVss
AVrefh
AVrefl
AN0 to AN7
AN8 to AN15
refl
), a protection circuit should be
This LSI