UPD70F3771GF-GAT-AX Renesas Electronics America, UPD70F3771GF-GAT-AX Datasheet - Page 709

• Manufacturer Part Number: UPD70F3771GF-GAT-AX
• Description: MCU 32BIT V850ES/JX3-H 128-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Hr

Specifications of UPD70F3771GF-GAT-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 48MHz
• Connectivity: CAN, CSI, EBI/EMI, I²C, UART/USART, USB
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 96
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 3.6 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

V850ES/JG3-H, V850ES/JH3-H
R01UH0042EJ0400 Rev.4.00
Sep 30, 2010
(7) AV
(8) Reading ADA0CRn register
(9) External trigger mode
(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.
acknowledged, the contents of the ADA0CRn register may be undefined.
completion of conversion and before the next external/timer trigger is acknowledged. The correct conversion result
may not be read at a timing different from the above.
When using the external trigger mode, the input trigger during A/D conversion will not be acknowledged.
REF0
function ports. In an application where a backup power supply is used, be sure to supply the same potential as
V
the AV
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
reference voltage fluctuation as shown in Figure 15-15.
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.
Note Parasitic inductance
DD
pin
to the AV
REF0
REF0
REF0
pin has a high impedance or if the power supply has a low current supply capability, the reference
pin is used as the power supply pin of the A/D converter and also supplies power to the alternate-
pin is also used as the reference voltage pin of the A/D converter. If the source supplying power to
REF0
pin as shown in Figure 15-15.
Main power supply
Figure 15-15. AV
REF0
REF0
pin has a high DC resistance (for example, because of insertion of
Note
Pin Processing Example
AV
AV
Also, when an external/timer trigger is
REF0
SS
CHAPTER 15 A/D CONVERTER
REF0
Read the conversion result after
and AV
SS
pins to suppress the
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