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Ver.0.10
11.4 Precautions on Using A-D Converters
• Forcible termination during scan operation
If A-D conversion is halted by setting the A-D conversion stop bit (AD0CSTP, AD1CSTP) to 1
during scan mode operation and you read the content of the A-D data register for the channel in
which conversion was in progress, it shows the last conversion result that had been transferred to
the A-D data register before the conversion was forcibly terminated.
____________
• ADTRG signal and input/output port
____________
If you selected the ADTRG signal for an A-D conversion start trigger, do not use the ADTRG pin
as an input/output port (P67).
• Modification of A-D converter related registers
If you want to change the contents of the A-D Conversion Interrupt Control Register, each Single
and Scan Mode Register, or A-D Successive Approximation Register, except for the A-D
conversion stop bit, do your change while A-D conversion is inactive, or be sure to restart A-D
conversion after you changed the register contents. If the contents of these registers are
changed in the middle of A-D conversion, the conversion results cannot be guaranteed.
• Handling of analog input signals
The A-D converters included in the 32170 do not have a sample-and-hold circuit. Therefore,
make sure the analog input levels are fixed during A-D conversion.
• A-D conversion completion bit readout timing
If you want to read the A-D conversion completion bit (Single Mode Register 0's D5 bit or Scan
Mode Register 0's D5 bit) immediately after A-D conversion has started, be sure to adjust the
timing one clock cycle by, for example, inserting a NOP instruction before you read.
A-D CONVERTERS
11.4 Precautions on Using A-D Converters
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...