11
11-2
Rev.1.0
11.1 Outline of the A-D Converters
The 32172/32173 contains two 10-bit resolution A-D converters based on successive
approximation method (A-D0 and A-D1 Converters). The A-D0 Converter has eight channels of
dedicated analog input pins (AD0IN0-AD0IN7) and eight other channels of analog input pins which
are shared with input/output ports or internal peripheral I/O input/output pins (AD0IN8-AD0IN15),
for a total of 16 channels. The A-D1 Converter has four channels of dedicated analog input pins
(AD1IN0-AD1IN3) and 12 other channels of analog input pins which are shared with input/output
ports or internal peripheral I/O input/output pins (AD1IN4-AD1IN15), for a total of 16 channels.
For both converters, the A-D converted value can be read out in either 8 bits or 10 bits.
The A-D converters have the following conversion modes and operation modes.
(1) Conversion modes
•
A-D conversion mode:
This is an ordinary mode, in which analog input voltages are
A-D converted.
•
Comparator mode (Note): In this mode, the set comparison voltage and the analog
input voltage are compared to determine which is larger or
smaller than the other (single mode only).
(2) Operation modes
•
Single mode: The analog input voltage on one channel is A-D converted once or
comparated (note).
•
Scan mode: Analog input voltages on multiple channels are sequentially A-D
converted.
(3) Types of scan modes
•
Single-shot scan mode: Scan operation is performed only one cycle.
•
Continuous scan mode: Scan operation is performed repeatedly until halted.
(4) Special operation modes
•
Forcibly execute single mode during scan mode operation:
Single mode conversion is forcibly executed during scan operation.
•
Start scan mode after executing single mode:
Scan operation is started from single mode in succession.
•
Restart conversion:
A-D convert operation under way is restarted in single or scan mode.
The A-D conversion and comparate speed can be selected from four speeds available: low speed
(normal or twice normal) or high speed (normal or twice normal). Also, an A-D conversion interrupt
request or DMA transfer request can be generated when the A-D conversion, comparate, or single-
shot scan is finished, or each time one cycle of continuous scan mode is finished.
Note: The comparison performed internally by the A-D converter which is of the successive approximation
type and its operation in comparator mode where the A-D converter is used as a comparator are
different. In this manual, therefore, operation in comparator mode is referred to as "comparate" in
order to discriminate it against ordinary comparison.
A-D CONVERTERS
11.1 Outline of the A-D Converters
Содержание 32172
Страница 20: ... This is a blank page 16 ...
Страница 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Страница 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Страница 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Страница 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Страница 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Страница 240: ...8 8 40 Rev 1 0 This is a blank page INPUT OUTPUT PORTS AND PIN FUNCTIONS 8 5 Precautions on Input Output Ports ...
Страница 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Страница 416: ...10 10 118 Rev 1 0 This is a blank page INPUT OUTPUT TIMERS 10 6 TOM Output Related 16 bit Timers ...
Страница 658: ...14 14 16 Rev 1 0 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 718: ...16 16 16 Rev 1 0 This is a blank page D A CONVERTERS 16 3 Functional Description of the D A Converters ...
Страница 766: ...18 18 22 Rev 1 0 WAIT CONTROLLER 18 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 777: ...CHAPTER 20 CHAPTER 20 OSCILLATION CIRCUIT 20 1 Oscillator Circuit 20 2 Clock Generator Circuit ...
Страница 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Страница 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Страница 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Страница 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 861: ...Appendix 2 1 M32R E Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...