C8051F97X View Datasheet(PDF) - Silicon Laboratories
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C8051F97X Datasheet PDF : 455 Pages
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20. CIP-51 Microcontroller Core ........................................................................................... 164
20.1.Performance .............................................................................................................. 164
20.2.Programming and Debugging Support ...................................................................... 165
20.3.Instruction Set ............................................................................................................ 165
20.3.1.Instruction and CPU Timing............................................................................... 165
20.4.SFR Paging................................................................................................................170
20.5.CPU Core Registers .................................................................................................. 177
21. Direct Memory Access (DMA0)....................................................................................... 187
21.1.DMA0 Architecture..................................................................................................... 188
21.2.DMA0 Arbitration........................................................................................................ 188
21.2.1.DMA0 Memory Access Arbitration..................................................................... 188
21.2.2.DMA0 channel arbitration .................................................................................. 189
21.3.DMA0 Operation in Low Power Modes...................................................................... 189
21.4.Transfer Configuration ...............................................................................................189
21.5.DMA0 Registers......................................................................................................... 190
22. Multiply and Accumulate (MAC0) ................................................................................... 202
22.1.Special Function Registers ........................................................................................203
22.2.Integer and Fractional Math ....................................................................................... 203
22.3.Operating in Multiply and Accumulate Mode ............................................................. 204
22.4.Operating in Multiply Only Mode................................................................................ 204
22.5.MCU Mode Operation ................................................................................................ 205
22.6.DMA Mode Operation ................................................................................................ 205
22.7. Accumulator 1-Bit Shift Operations........................................................................... 207
22.8.Multi-Bit Shift Accumulator Operation ........................................................................ 208
22.9.Accumulator Alignment (Right Byte Shift).................................................................. 209
22.10.Rounding and Saturation ......................................................................................... 209
22.11.Usage Examples......................................................................................................211
22.11.1.Multiply and Accumulate in Fractional Mode ................................................... 211
22.11.2.Multiply Only in Integer Mode ..........................................................................211
22.11.3.Initializing Memory Block Using DMA0 and MAC0.......................................... 212
22.12.MAC0 Registers....................................................................................................... 213
23. Cyclic Redundancy Check Unit (CRC0)......................................................................... 232
23.1.CRC Algorithm ........................................................................................................... 232
23.2.Preparing for a CRC Calculation................................................................................ 234
23.3.Performing a CRC Calculation................................................................................... 234
23.4.Accessing the CRC0 Result....................................................................................... 234
23.5.CRC0 Bit Reverse Feature ........................................................................................234
23.6.CRC Control Registers .............................................................................................. 235
24. Clocking Sources.............................................................................................................241
24.1.Programmable Precision Internal Oscillator............................................................... 242
24.2.Low Power Internal Oscillator .................................................................................... 242
24.3.External Oscillator Drive Circuit .................................................................................242
24.3.1.External Crystal Mode ....................................................................................... 242
24.3.2.External RC Mode ............................................................................................. 243
24.3.3.External Capacitor Mode ................................................................................... 245
24.3.4.External CMOS Clock Mode.............................................................................. 245
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Rev 1.1
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