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Chapter 44 A/D Converter
4.Operation of A/D Converter
4. Operation of A/D Converter
The A/D converter operates using the successive approximation method with 10-bit or 8-bit resolution. As only
one 16-bit register is provided to store conversion results, the conversion data register (ADCR0 and ADCR1) is
updated each time conversion completes. Therefore, as the A/D converter on its own is not suitable for
performing continuous conversion, it is recommended that you use the DMA service. The following describes the
operation modes.
■
Single Mode
In single conversion mode, the analog input signals selected by the ANS bits and ANE bits are converted
in order until the completion of conversion on the end channel determined by the ANE bits. A/D
conversion then ends. If the start channel and end channel are the same (ANS=ANE), only a signal
channel conversion is performed.
ex.
ANS=00000b, ANE=00011b
Start -> AN0 -> AN1 -> AN2 -> AN3 -> End
ANS=00010b, ANE=00010b
Start -> AN2 -> End
■
Continuous Mode
In continuous mode the analog input signals selected by the ANS bits and ANE bits are converted in
order until the completion of conversion on the end channel determined by the ANE bits, then the
converter returns to the ANS channel for analog input and repeats the process continuously. When
the start and end channels are the same (ANS=ANE), conversion is performed continuously for that
channel.
ex.
ANS=00000b, ANE=00011b
Start -> AN0 -> AN1 -> AN2 -> AN3 -> AN0 ... -> repeat
ANS=00010b, ANE=00010b
Start -> AN2 -> AN2 -> AN2 ... -> repeat
In continuous mode, conversion is repeated until '0' is written to the BUSY bit. (Writing '0' to the BUSY bit
forcibly stops the conversion operation.) Note that forcibly terminating operation halts the current
conversion during mid-conversion. (If operation is forcibly terminated, the value in the conversion
register is the result of the most recently completed conversion.)
■
Stop Mode
In stop mode the analog input signal selected by the ANS bits and ANE bits are converted in order, but
conversion operation pauses for each channel. The pause is released by applying another start
signal.
At the completion of conversion on the end channel determined by the ANE bits, the converter returns to
the ANS channel for analog input signal and repeats the conversion process continuously. When the
start and end channel are the same (ANS=ANE), only a signal channel conversion is performed.
ex.
ANS=00000b, ANE=00011b
Start -> AN0 -> stop -> start -> AN1 -> stop -> start -> AN2 -> stop -> start -> AN3 -> stop ->
start -> AN0 ... -> repeat
ANS=00010b, ANE=00010b
Start -> AN2 -> stop -> start -> AN2 -> stop -> start -> AN2 ... -> repeat
In stop mode the startup source is only the source determined by the STS1, STS0 bits. This mode
enables synchronization of the conversion start signal.
Summary of Contents for FR Family FR60 Lite
Page 2: ...FUJITSU LIMITED ...
Page 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
Page 15: ...xi ...
Page 16: ...xii ...
Page 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Page 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Page 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 169: ...153 Chapter 9 Reset 10 Caution ...
Page 170: ...154 Chapter 9 Reset 10 Caution ...
Page 180: ...164 Chapter 10 Standby 7 Q A ...
Page 182: ...166 Chapter 10 Standby 8 Caution ...
Page 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
Page 200: ...184 Chapter 12 Instruction Cache 2 Main body structure Figure 2 4 I Cacheable Area ...
Page 222: ...206 Chapter 13 Clock Control 8 Caution ...
Page 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Page 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Page 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Page 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Page 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Page 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Page 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Page 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Page 412: ...396 Chapter 28 Bit Search 8 Caution ...
Page 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Page 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Page 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Page 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Page 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Page 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Page 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Page 790: ...774 Chapter 37 Output Compare 8 Caution ...
Page 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Page 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Page 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Page 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Page 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Page 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Page 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Page 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Page 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Page 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Page 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Page 1032: ...1016 Chapter 55 Flash Security 4 Register ...
Page 1034: ...1018 Chapter 56 Electrical Specification ...
Page 1035: ...FR60 MB91460 Series Hardware Manual European Microcontroller Design Centre Author MBo ...
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