C8051F336_08 Datasheet, PDF (5/227 Pages) Silicon Laboratories – Mixed-Signal Byte-Programmable EPROM MCU

C8051F336/7/8/9
20.1.3. Interfacing Port I/O to 5V Logic ............................................................. 121
20.2. Assigning Port I/O Pins to Analog and Digital Functions............................... 122
20.2.1. Assigning Port I/O Pins to Analog Functions ........................................ 122
20.2.2. Assigning Port I/O Pins to Digital Functions.......................................... 122
20.2.3. Assigning Port I/O Pins to External Event Trigger Functions................ 123
20.3. Priority Crossbar Decoder ............................................................................. 124
20.4. Port I/O Initialization ...................................................................................... 126
20.5. Port Match ..................................................................................................... 129
20.6. Special Function Registers for Accessing and Configuring Port I/O ............. 131
21. SMBus................................................................................................................... 138
21.1. Supporting Documents .................................................................................. 139
21.2. SMBus Configuration..................................................................................... 139
21.3. SMBus Operation .......................................................................................... 139
21.3.1. Transmitter Vs. Receiver....................................................................... 140
21.3.2. Arbitration.............................................................................................. 140
21.3.3. Clock Low Extension............................................................................. 140
21.3.4. SCL Low Timeout.................................................................................. 140
21.3.5. SCL High (SMBus Free) Timeout ......................................................... 141
21.4. Using the SMBus........................................................................................... 141
21.4.1. SMBus Configuration Register.............................................................. 141
21.4.2. SMB0CN Control Register .................................................................... 145
21.4.2.1. Software ACK Generation ............................................................ 145
21.4.2.2. Hardware ACK Generation ........................................................... 145
21.4.3. Hardware Slave Address Recognition .................................................. 147
21.4.4. Data Register ........................................................................................ 150
21.5. SMBus Transfer Modes................................................................................. 151
21.5.1. Write Sequence (Master) ...................................................................... 151
21.5.2. Read Sequence (Master) ...................................................................... 152
21.5.3. Write Sequence (Slave) ........................................................................ 153
21.5.4. Read Sequence (Slave) ........................................................................ 154
21.6. SMBus Status Decoding................................................................................ 154
22. UART0 ................................................................................................................... 159
22.1. Enhanced Baud Rate Generation.................................................................. 160
22.2. Operational Modes ........................................................................................ 161
22.2.1. 8-Bit UART ............................................................................................ 161
22.2.2. 9-Bit UART ............................................................................................ 162
22.3. Multiprocessor Communications ................................................................... 163
23. Enhanced Serial Peripheral Interface (SPI0) ..................................................... 167
23.1. Signal Descriptions........................................................................................ 168
23.1.1. Master Out, Slave In (MOSI)................................................................. 168
23.1.2. Master In, Slave Out (MISO)................................................................. 168
23.1.3. Serial Clock (SCK) ................................................................................ 168
23.1.4. Slave Select (NSS) ............................................................................... 168
23.2. SPI0 Master Mode Operation ........................................................................ 169
23.3. SPI0 Slave Mode Operation .......................................................................... 170
Rev.1.0
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