UPD78F9418A NEC, UPD78F9418A Datasheet - Page 162
UPD78F9418A
Manufacturer Part Number
UPD78F9418A
Description
(UPD7894xxA) 8-Bit Single Chip Microcontrollers
Manufacturer
NEC
Datasheet
1.UPD78F9418A.pdf
(319 pages)
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11.5 Cautions on Using 10-Bit A/D Converter
162
(1)
(2)
(3)
(4)
(5)
<1> Conflict between writing to A/D conversion result register 0 (ADCR0) at the end of conversion and
<2> Conflict between writing to the ADCR0 bit at the end of conversion and writing to A/D converter mode
Current consumption in the standby mode
When the A/D converter enters the standby mode, it stops operating. Setting the bit 7 (ADCS0) of A/D
converter mode register 0 (ADM0) = 0 can reduce the current consumption.
Figure 11-7 shows how to reduce the current consumption in the standby mode.
Input range for the ANI0 to ANI6 pins
Be sure to keep the input voltage at ANI0 to ANI6 within the rated range. If a voltage greater than AV
less than AV
output of the channel becomes undefined, and the conversion output of the other channels may be affected.
Conflict
Conversion results immediately following start of A/D conversion
The first A/D conversion value immediately following the start of A/D conversion may be undefined. Be sure
to poll the A/D conversion end interrupt request (INTAD0) and perform processing such as discarding the
first conversion result.
Timing that makes the A/D conversion result undefined
If the timing of the end of A/D conversion and the timing of the stop of operation of the A/D converter conflict,
the A/D conversion value may be undefined. Because of this, be sure to read out the A/D conversion result
while the A/D converter is in operation. Furthermore, when reading out an A/D conversion result after A/D
conversion has stopped, be sure to have done so by the time the next conversion result is complete.
The conversion result readout timing is shown in Figures 11-8 and 11-9.
reading from the ADCR0 bit
Reading from the ADCR0 bit takes precedence. After reading, the new conversion result is written to
ADCR0 bit.
register 0 (ADM0) or A/D input selection register 0 (ADS0)
Writing to ADM0 or ADS0 takes precedence. A request to write to the ADCR0 bit is ignored. No A/D
conversion end interrupt request signal (INTAD0) is generated.
SS
Figure 11-7. How to Reduce Current Consumption in Standby Mode
(even within the absolute maximum rating) is input a conversion channel, the conversion
AV
AV
REF
SS
User’s Manual U13952EJ3V0UD
P-ch
Series resistor string
ADCS0
REF
or
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