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20.4.4 EP1 Bulk-OUT Transfer (Dual FIFOs) ................................................................ 774
20.4.5 EP2 Bulk-IN Transfer (Dual FIFOs) .................................................................... 776
20.4.6 EP3 Interrupt-IN Transfer..................................................................................... 778
20.5 Processing of USB Standard Commands and Class/Vendor Commands .......................... 779
20.5.1 Processing of Commands Transmitted by Control Transfer................................. 779
20.6 Stall Operations.................................................................................................................. 780
20.6.1 Forcible Stall by Application ................................................................................ 780
20.6.2 Automatic Stall by USB Function Module ........................................................... 782
20.7 DMA Transfer.................................................................................................................... 784
20.7.1 DMA Transfer for Endpoint 1 .............................................................................. 784
20.7.2 DMA Transfer for Endpoint 2 .............................................................................. 785
20.8 Example of USB External Circuitry .................................................................................. 786
20.9 USB Bus Power Control Method....................................................................................... 789
20.9.1 USB Bus Power Control Operation ...................................................................... 789
20.9.2 Usage Example of USB Bus Power Control Method ........................................... 790
20.10 Notes on Usage .................................................................................................................. 794
20.10.1 Receiving Setup Data ........................................................................................... 794
20.10.2 Clearing FIFO....................................................................................................... 794
20.10.3 Overreading or Overwriting Data Register........................................................... 794
20.10.4 Assigning Interrupt Source for EP0...................................................................... 795
20.10.5 Clearing FIFO when Setting DMA Transfer ........................................................ 795
20.10.6 Manual Reset for DMA Transfer.......................................................................... 795
20.10.7 USB Clock............................................................................................................ 795
20.10.8 Using TR Interrupt................................................................................................ 795
Section 21 A/D Converter ................................................................................. 797
21.1 Features.............................................................................................................................. 797
21.1.1 Block Diagram...................................................................................................... 798
21.1.2 Input Pins.............................................................................................................. 799
21.1.3 Register Configuration.......................................................................................... 800
21.2 Register Descriptions......................................................................................................... 800
21.2.2 A/D Control/Status Registers (ADCSR0, ADCSR1)............................................ 801
21.2.3 A/D0, A/D1 Control Register (ADCR) ................................................................ 804
21.3 Operation ........................................................................................................................... 805
21.3.1 Single Mode.......................................................................................................... 805
21.3.2 Multi Mode ........................................................................................................... 806
21.3.3 Scan Mode ............................................................................................................ 808
21.3.4 Simultaneous Sampling Operation ....................................................................... 809
21.3.5 A/D Converter Activation by MTU...................................................................... 810
Rev. 4.00 Sep. 14, 2005 Page xxiv of l
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