![](http://datasheet.mmic.net.cn/340000/8051F330_datasheet_16452108/8051F330_5.png)
Rev. 1.4
5
C8051F330/1/2/3/4/5
15.3.SMBus Operation........................................................................................... 136
15.3.1.Arbitration............................................................................................... 137
15.3.2.Clock Low Extension.............................................................................. 138
15.3.3.SCL Low Timeout................................................................................... 138
15.3.4.SCL High (SMBus Free) Timeout .......................................................... 138
15.4.Using the SMBus............................................................................................ 138
15.4.1.SMBus Configuration Register............................................................... 140
15.4.2.SMB0CN Control Register..................................................................... 143
15.4.3.Data Register......................................................................................... 146
15.5.SMBus Transfer Modes.................................................................................. 146
15.5.1.Master Transmitter Mode....................................................................... 146
15.5.2.Master Receiver Mode........................................................................... 148
15.5.3.Slave Receiver Mode............................................................................. 149
15.5.4.Slave Transmitter Mode......................................................................... 150
15.6.SMBus Status Decoding................................................................................. 150
16.UART0.................................................................................................................... 153
16.1.Enhanced Baud Rate Generation................................................................... 154
16.2.Operational Modes......................................................................................... 155
16.2.1.8-Bit UART............................................................................................. 155
16.2.2.9-Bit UART............................................................................................. 156
16.3.Multiprocessor Communications .................................................................... 156
17.Enhanced Serial Peripheral Interface (SPI0)...................................................... 163
17.1.Signal Descriptions......................................................................................... 163
17.1.1.Master Out, Slave In (MOSI).................................................................. 164
17.1.2.Master In, Slave Out (MISO).................................................................. 164
17.1.3.Serial Clock (SCK)................................................................................. 164
17.1.4.Slave Select (NSS) ................................................................................ 164
17.2.SPI0 Master Mode Operation......................................................................... 164
17.3.SPI0 Slave Mode Operation........................................................................... 166
17.4.SPI0 Interrupt Sources................................................................................... 167
17.5.Serial Clock Timing......................................................................................... 167
17.6.SPI Special Function Registers...................................................................... 169
18.Timers ................................................................................................................... 177
18.1.Timer 0 and Timer 1....................................................................................... 177
18.1.1.Mode 0: 13-bit Counter/Timer................................................................ 177
18.1.2.Mode 1: 16-bit Counter/Timer................................................................ 178
18.1.3.Mode 2: 8-bit Counter/Timer with Auto-Reload...................................... 179
18.1.4.Mode 3: Two 8-bit Counter/Timers (Timer 0 Only)................................. 180
18.2.Timer 2 .......................................................................................................... 185
18.2.1.16-bit Timer with Auto-Reload................................................................ 185
18.2.2.8-bit Timers with Auto-Reload................................................................ 186
18.3.Timer 3 .......................................................................................................... 189
18.3.1.16-bit Timer with Auto-Reload................................................................ 189
18.3.2.8-bit Timers with Auto-Reload................................................................ 190