UPD70F3744GJ-GAE-AX Renesas Electronics America, UPD70F3744GJ-GAE-AX Datasheet - Page 886

• Manufacturer Part Number: UPD70F3744GJ-GAE-AX
• Description: MCU 32BIT V850ES/JX3 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3r

Specifications of UPD70F3744GJ-GAE-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 32MHz
• Connectivity: CSI, EBI/EMI, I²C, UART/USART
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 128
• Program Memory Size: 512KB (512K 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 16x10b; 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/JJ3
R01UH0016EJ0400 Rev.4.00
Sep 30, 2010
A/D
converter
Function
Input range of
ANI0 to ANI15
pins
Countermeasures
against noise
Alternate I/O
Interrupt request
flag (ADIF)
AV
Reading
ADA0CRn
register
REF0
Details of
Function
pin
Input the voltage within the specified range to the ANI0 to ANI15 pins. If a voltage
equal to or higher than AV
range of the absolute maximum ratings) is input to any of these pins, the
conversion value of that channel is undefined, and the conversion value of the
other channels may also be affected.
To maintain the 10-bit resolution, the ANI0 to ANI15 pins must be effectively
protected from noise. The influence of noise increases as the output impedance
of the analog input source becomes higher. To lower the noise, connecting an
external capacitor as shown in Figure 13-12 is recommended.
The analog input pins (ANI0 to ANI15) function alternately as port pins. When
selecting one of the ANI0 to ANI15 pins to execute A/D conversion, do not
execute an instruction to read an input port or write to an output port during
conversion as the conversion resolution may drop.
Also the conversion resolution may drop at the pins set as output port pins during
A/D conversion if the output current fluctuates due to the effect of the external
circuit connected to the port pins.
If a digital pulse is applied to a pin adjacent to the pin whose input signal is being
converted, the A/D conversion value may not be as expected due to the influence
of coupling noise. Therefore, do not apply a pulse to a pin adjacent to the pin
undergoing A/D conversion.
The interrupt request flag (ADIF) is not cleared even if the contents of the ADA0S
register are changed. If the analog input pin is changed during A/D conversion,
therefore, the result of converting the previously selected analog input signal may
be stored and the conversion end interrupt request flag may be set immediately
before the ADA0S register is rewritten. If the ADIF flag is read immediately after
the ADA0S register is rewritten, the ADIF flag may be set even though the A/D
conversion of the newly selected analog input pin has not been completed. When
A/D conversion is stopped, clear the ADIF flag before resuming conversion.
(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. The correct conversion
result may not be read at a timing different from the above.
supplies power to the alternate-function ports. In an application where a
backup power supply is used, be sure to supply the same voltage as V
the AV
If the source supplying power to the AV
power supply has a low current supply capability, 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.
example, because of 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.
REF0
REF0
REF0
pin as shown in Figure 13-15.
pin is used as the power supply pin of the A/D converter and also
pin is also used as the reference voltage pin of the A/D converter.
REF0
or equal to or lower than AV
Cautions
REF0
REF0
pin has a high impedance or if the
pin has a high DC resistance (for
APPENDIX E LIST OF CAUTIONS
REF0
SS
and AV
(even within the
SS
pins to
DD
to
Page 870 of 892
p. 451
p. 451
p. 451
p. 452
p. 453
p. 453
Page
(17/37)