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Chapter 14
A/D Converter
User’s Manual U16580EE3V1UD00
14.8 Precautions
(1)
Stopping conversion operation
When the ADCEn bit of the ADMn0 register is cleared to 0 during a conversion operation, the
conversion operation stops and the conversion results are not stored in the ADCRnm register
(n = 0, 1), (m = 0 to 9).
(2)
External/timer trigger interval
Set the interval (input time interval) of the trigger in the external or timer trigger mode longer than
the conversion time specified by the FRn3 to FRn0 bits of the ADMn1 register.
When 0 < interval
≤
conversion operation time
When the following external trigger or timer trigger is input during a conversion operation, the
conversion operation is aborted and the conversion starts according to the last external trigger
input or timer trigger input.
When conversion operations are aborted, the conversion results are not stored in the ADCRnm
register (n = 0, 1) (m = 0 to 9). However, the number of times the trigger has been input is counted.
When an interrupt occurs, the values that have been converted are stored in the ADCRnm
register.
(3)
Operation in HALT mode
A/D conversion continues in the HALT mode. When this mode is released by NMI input or
unmasked maskable interrupt input (see section
8.3.2 (2) ”Releasing HALT mode” on
), the ADMn0, ADMn1, and ADMn2 registers as well as the ADCRnm register hold the
value (n = 0, 1) (m = 0 to 9).
(4)
Input range of ANIn0 to ANIn9
Use the input voltage at ANIn0 to ANIn9 within the specified range. If a voltage outside the range
of AV
REF
is input to any of these pins (even within the absolute maximum rating range), the
converted value of the channel is undefined. In addition, the converted value of the other channels
may also be affected.
(5)
Conflicts
(a) Conflict between writing A/D conversion result registers (ADCRnm, ADCRnmH) at end
of conversion and reading ADCRnm and ADCRnmH registers by instruction
Reading the ADCRnm and ADCRnmH registers takes precedence. After these registers have
been read, the new conversion result is written to the ADCRnm and ADCRnmH registers.
(b) Conflict between writing ADCRnm and ADCRnmH at end of conversion and input of
external trigger signal
The external trigger signal is not accepted during A/D conversion. Therefore, it is not accepted
while ADCRnm and ADCRnmH are being written.
(c) Conflict between writing ADCRnm and ADCRnmH at end of conversion and writing
ADMn1 or ADMn2 register
If ADMn1 or ADMn2 register is written immediately after ADCRnm and ADCRnmH have been
written on completion of A/D conversion, the conversion result is written to the ADCRnm and
ADCRnmH registers, but the A/D conversion end interrupt (INTADn) may not occur depending on
the timing.
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Страница 192: ...192 Chapter 5 Memory Access Control Function μPD70F3187 only User s Manual U16580EE3V1UD00 MEMO ...
Страница 312: ...312 Chapter 9 16 Bit Timer Event Counter P User s Manual U16580EE3V1UD00 MEMO ...
Страница 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00 ...
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Страница 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO ...
Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO ...
Страница 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO ...
Страница 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO ...
Страница 1046: ...1046 Appendix A Index User s Manual U16580EE3V1UD00 MEMO ...
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