Rev. 0.5
5
C8051F340/1/2/3/4/5/6/7
14. Oscillators ............................................................................................................. 135
14.1.Programmable Internal High-Frequency (H-F) Oscillator ............................... 136
14.1.1.Internal H-F Oscillator Suspend Mode ................................................... 136
14.2.Programmable Internal Low-Frequency (L-F) Oscillator ................................ 137
14.2.1.Calibrating the Internal L-F Oscillator..................................................... 137
14.3.External Oscillator Drive Circuit...................................................................... 139
14.3.1.Clocking Timers Directly Through the External Oscillator...................... 139
14.3.2.External Crystal Example....................................................................... 139
14.3.3.External RC Example............................................................................. 140
14.3.4.External Capacitor Example................................................................... 140
14.4.4x Clock Multiplier .......................................................................................... 142
14.5.System and USB Clock Selection .................................................................. 143
14.5.1.System Clock Selection ......................................................................... 143
14.5.2.USB Clock Selection .............................................................................. 143
15. Port Input/Output.................................................................................................. 147
15.1.Priority Crossbar Decoder .............................................................................. 149
15.2.Port I/O Initialization ....................................................................................... 151
15.3.General Purpose Port I/O ............................................................................... 154
16. Universal Serial Bus Controller (USB0).............................................................. 163
16.1.Endpoint Addressing ...................................................................................... 164
16.2.USB Transceiver ............................................................................................ 164
16.3.USB Register Access ..................................................................................... 166
16.4.USB Clock Configuration................................................................................ 170
16.5.FIFO Management ......................................................................................... 171
16.5.1.FIFO Split Mode ..................................................................................... 171
16.5.2.FIFO Double Buffering ........................................................................... 172
16.5.3.FIFO Access .......................................................................................... 172
16.6.Function Addressing....................................................................................... 173
16.7.Function Configuration and Control................................................................ 173
16.8.Interrupts ........................................................................................................ 176
16.9.The Serial Interface Engine ............................................................................ 180
16.10.Endpoint0 ..................................................................................................... 180
16.10.1.Endpoint0 SETUP Transactions .......................................................... 181
16.10.2.Endpoint0 IN Transactions................................................................... 181
16.10.3.Endpoint0 OUT Transactions............................................................... 182
16.11.Configuring Endpoints1-3 ............................................................................. 184
16.12.Controlling Endpoints1-3 IN.......................................................................... 184
16.12.1.Endpoints1-3 IN Interrupt or Bulk Mode............................................... 184
16.12.2.Endpoints1-3 IN Isochronous Mode..................................................... 185
16.13.Controlling Endpoints1-3 OUT...................................................................... 187
16.13.1.Endpoints1-3 OUT Interrupt or Bulk Mode........................................... 187
16.13.2.Endpoints1-3 OUT Isochronous Mode................................................. 188
17. SMBus ................................................................................................................... 193
17.1.Supporting Documents ................................................................................... 194
17.2.SMBus Configuration...................................................................................... 194
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