Fujitsu FR81S User Manual
CHAPTER 44: 12-BIT A/D CONVERTER
6. Notes
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: 12-BIT A/D CONVERTER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
118
final activation channel of the continuous scan conversion is executed.
About the continuous scan conversion when the conversion count of each
channel is specified
Please set the activation channel to which scan conversion execution enable by the conversion count
specification to the repeat conversion mode.
When the continuous scan conversion mode of the conversion count of each channel specification, the
EOCF bit set to the final channel of the scan conversion is cleared to "0" immediately even if set in "1"
because it is restarted from the top immediately after the scan conversion is completed.
When the continuous scan conversion mode of the conversion count of each channel specification, when the
same activation factor as scan conversion target is set to the activation channel that is larger than the final
channel of continuous scan conversion, the activation channel that is larger than the final channel is
evaluated once by the A/D activation arbitration of latter part after completing the final channel of the
continuous scan conversion.
When the stop scan conversion mode of the conversion count of each channel specification, when the same
activation factor as scan conversion target is set to the activation channel that is larger than the final channel
of stop scan conversion, the activation channel that is larger than the final channel can execute the A/D
conversion only for the stop period.
The release timing in the data protection state does not have the restriction for a data protection function
effective. However, when the activation channel that does the scan conversion is a data protection state, the
scan conversion stops until the data protection state is released.
About the setting of the sampling time and the compare time
Please set the ST1, ST0/STCHn1, and the STCHn0 (n=00 to 47) bit to become 700ns(4.5V to
5.5V)/1000ns(2.7V to 5.5V) or more at the sampling time. When the sampling time is set to 700ns/1000ns
or less, a normal value of the analog conversion value might not be obtained.
Please set the CT1 and the CT0 bit to become 700ns or more at the comparison time. When the compare
time is set to 700ns or less, a normal value of the analog conversion value might not be obtained.
About the setting of the ADMD register and ADSTPCS
Please rewrite bit of the A/D mode setting register (ADMD) and the sampling time setting register
(ADSTPCS) when the A/D operation has stopped before conversion operation.
MB91520 Series
MN705-00010-1v0-E
1921