C8051F321-GMR Datasheet, PDF (5/250 Pages) Silicon Laboratories – Full Speed USB, 16 k ISP FLASH MCU Family

C8051F320/1
13.4.1.System Clock Selection ......................................................................... 123
13.4.2.USB Clock Selection .............................................................................. 123
14. Port Input/Output ................................................................................................ 126
14.1.Priority Crossbar Decoder .............................................................................. 128
14.2.Port I/O Initialization ....................................................................................... 130
14.3.General Purpose Port I/O ............................................................................... 132
15. Universal Serial Bus Controller (USB)................................................................ 139
15.1.Endpoint Addressing ...................................................................................... 140
15.2.USB Transceiver ............................................................................................ 140
15.3.USB Register Access ..................................................................................... 142
15.4.USB Clock Configuration................................................................................ 146
15.5.FIFO Management ......................................................................................... 147
15.5.1.FIFO Split Mode ..................................................................................... 147
15.5.2.FIFO Double Buffering ........................................................................... 148
15.5.3.FIFO Access .......................................................................................... 148
15.6.Function Addressing....................................................................................... 149
15.7.Function Configuration and Control................................................................ 149
15.8.Interrupts ........................................................................................................ 152
15.9.The Serial Interface Engine ............................................................................ 157
15.10.Endpoint0 ..................................................................................................... 157
15.10.1.Endpoint0 SETUP Transactions .......................................................... 158
15.10.2.Endpoint0 IN Transactions................................................................... 158
15.10.3.Endpoint0 OUT Transactions............................................................... 159
15.11.Configuring Endpoints1–3 ............................................................................ 161
15.12.Controlling Endpoints1–3 IN......................................................................... 161
15.12.1.Endpoints1-3 IN Interrupt or Bulk Mode............................................... 161
15.12.2.Endpoints1-3 IN Isochronous Mode..................................................... 162
15.13.Controlling Endpoints1–3 OUT..................................................................... 164
15.13.1.Endpoints1-3 OUT Interrupt or Bulk Mode........................................... 164
15.13.2.Endpoints1-3 OUT Isochronous Mode................................................. 165
16. SMBus ................................................................................................................... 169
16.1.Supporting Documents ................................................................................... 170
16.2.SMBus Configuration...................................................................................... 170
16.3.SMBus Operation ........................................................................................... 170
16.3.1.Arbitration............................................................................................... 171
16.3.2.Clock Low Extension.............................................................................. 171
16.3.3.SCL Low Timeout................................................................................... 171
16.3.4.SCL High (SMBus Free) Timeout .......................................................... 172
16.4.Using the SMBus............................................................................................ 172
16.4.1.SMBus Configuration Register............................................................... 173
16.4.2.SMB0CN Control Register ..................................................................... 176
16.4.3.Data Register ......................................................................................... 179
16.5.SMBus Transfer Modes.................................................................................. 180
16.5.1.Master Transmitter Mode ....................................................................... 180
16.5.2.Master Receiver Mode ........................................................................... 181
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