UPD70F3451GC-UBT-A Renesas Electronics America, UPD70F3451GC-UBT-A Datasheet - Page 717

• Manufacturer Part Number: UPD70F3451GC-UBT-A
• Description: MCU 32BIT 128KB FLASH 80LQFP
• Manufacturer: Renesas Electronics America
• Series: V850E/Ix3r

Specifications of UPD70F3451GC-UBT-A

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 64MHz
• Connectivity: CSI, I²C, UART/USART
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 44
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3.5 V ~ 5.5 V
• Data Converters: A/D 10x12b, 4x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(6) AV
(7) Reading AD2CRn register
(8) A/D conversion result
When the AD2M0, AD2M1, or AD2S register is written, the contents of the AD2CRn register may be undefined.
Read the conversion result after completion of conversion and before writing to the AD2M0, AD2M1, and AD2S
registers. The correct conversion result may not be read at a timing different from the above.
If there is noise at the analog input pin (ANI2n) or at the power supply voltage pin (AV
generate an illegal conversion result.
Software processing will be needed to avoid a negative effect on the system from this illegal conversion result.
An example of this software processing is shown below.
• Take the average result of a number of A/D conversions and use that as the A/D conversion result.
• Execute a number of A/D conversions successively and use those results, omitting any exceptional results
• If an A/D conversion result that is judged to have generated a system malfunction is obtained, be sure to
(a) The AV
(b) The AV
(c) If the source supplying power to the AV
that may have been obtained.
recheck the system malfunction before performing counteractive measures.
DD2
alternate-function ports. In an application where a backup power supply is used, be sure to supply the
same potential as EV
power to the AV
the reference voltage may fluctuate due to the current that flows during conversion (especially,
immediately after the conversion operation enable (AD2CE bit = 1)).
accuracy may drop. To avoid this, it is recommended to connect a capacitor across the AV
pins to suppress the reference voltage fluctuation as shown in Figure 13-14.
insertion of a diode), the voltage when conversion is enabled may be lower than the voltage when
conversion is stopped, because of a voltage drop caused by the A/D conversion current.
pin
DD2
DD2
pin is also used as the reference voltage pin of the A/D converter 2. If the source supplying
pin is used as the power supply pin of the A/D converter 2 and also supplies power to the
DD2
Main power supply
pin has a high impedance or if the power supply has a low current supply capability,
DD0
Figure 13-14. AV
, EV
DD1
CHAPTER 13 A/D CONVERTER 2
, and EV
User’s Manual U18279EJ3V0UD
DD2
DD2
DD2
Pin Connection Example
(V850E/IG3 only) to the AV
pin has a high DC resistance (for example, because of
AV
AV
DD2
SS2
DD2
pin as shown in Figure 13-12.
As a result, the conversion
DD2
), that noise may
DD2
and AV
715
SS2