UPD70F3737GC-UEU-AX Renesas Electronics America, UPD70F3737GC-UEU-AX Datasheet - Page 454

• Manufacturer Part Number: UPD70F3737GC-UEU-AX
• Description: MCU 32BIT V850ES/JX3-L 100-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Lr

Specifications of UPD70F3737GC-UEU-AX

• Package / Case: *
• Voltage - Supply (vcc/vdd): 2.2 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 20MHz
• Number Of I /o: 84
• Core Processor: RISC
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Program Memory Size: 128KB (128K x 8)
• Data Converters: A/D 12x10b, D/A 2x8b
• Oscillator Type: Internal
• Peripherals: DMA, LVD, PWM, WDT
• Connectivity: CSI, EBI/EMI, I²C, UART/USART
• Core Size: 32-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

454
(7) AV
(8) Reading ADA0CRn register
(a) The AV
(b) The AV
(c) If the source supplying power to the AV
When the ADA0M0 to ADA0M2, ADA0S, ADA0PFM, or ADA0PFT register is written, the contents of the
ADA0CRn register may be undefined. Read the conversion result after completion of conversion and before
writing to the ADA0M0 to ADA0M2, ADA0S, ADA0PFM, or ADA0PFT register. Also, when an external/timer
trigger is acknowledged, the contents of the ADA0CRn register may be undefined. Read the conversion result
after completion of conversion and before the next external/timer trigger is acknowledged.
conversion result may not be read at a timing different from the above.
Note Parasitic inductance
REF0
alternate-function ports. In an application where a backup power supply is used, be sure to supply the
same voltage as V
power to the AV
the reference voltage may fluctuate due to the current that flows during conversion (especially, immediately
after the conversion operation enable bit ADA0CE has been set to 1). As a result, the conversion accuracy
may drop. To avoid this, it is recommended to connect a capacitor across the AV
suppress the reference voltage fluctuation as shown in Figure 13-15.
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
REF0
REF0
pin is also used as the reference voltage pin of the A/D converter. If the source supplying
pin is used as the power supply pin of the A/D converter and also supplies power to the
REF0
DD
Main power supply
pin has a high impedance or if the power supply has a low current supply capability,
to the AV
Figure 13-15. AV
Preliminary User’s Manual U18953EJ1V0UD
REF0
CHAPTER 13 A/D CONVERTER
pin as shown in Figure 13-15.
REF0
REF0
Note
Pin Processing Example
pin has a high DC resistance (for example, because of
AV
AV
REF0
SS
REF0
and AV
The correct
SS
pins to