C8051F901-GU Silicon Laboratories Inc, C8051F901-GU Datasheet - Page 6

• Manufacturer Part Number: C8051F901-GU
• Description: IC MCU 8BIT 8KB FLASH 24QSOP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F9xxr

Specifications of C8051F901-GU

• Program Memory Type: FLASH
• Program Memory Size: 8KB (8K x 8)
• Package / Case: 24-QSOP
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 0.9 V ~ 3.6 V
• Data Converters: A/D 15x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: C8051F9x
• Core: 8051
• Data Ram Size: 768 B
• Interface Type: UART
• Maximum Clock Frequency: 25 MHz
• Number Of Timers: 4
• Operating Supply Voltage: 0.9 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F912DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• Package: 24QSOP
• Device Core: 8051
• Family Name: C8051F90x
• Maximum Speed: 25 MHz
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1847-5

C8051F91x-C8051F90x
20. SmaRTClock (Real Time Clock) .......................................................................... 188
21. Port Input/Output.................................................................................................. 205
22. SMBus ................................................................................................................... 225
6
19.2.Low Power Internal Oscillator......................................................................... 180
19.3.External Oscillator Drive Circuit...................................................................... 180
19.4.Special Function Registers for Selecting and Configuring the System Clock 185
20.1.SmaRTClock Interface ................................................................................... 189
20.2.SmaRTClock Clocking Sources ..................................................................... 194
20.3.SmaRTClock Timer and Alarm Function ........................................................ 199
21.1.Port I/O Modes of Operation........................................................................... 206
21.2.Assigning Port I/O Pins to Analog and Digital Functions................................ 207
21.3.Priority Crossbar Decoder .............................................................................. 209
21.4.Port Match ...................................................................................................... 215
21.5.Special Function Registers for Accessing and Configuring Port I/O .............. 217
22.1.Supporting Documents ................................................................................... 226
22.2.SMBus Configuration...................................................................................... 226
19.3.1.External Crystal Mode............................................................................ 180
19.3.2.External RC Mode.................................................................................. 182
19.3.3.External Capacitor Mode........................................................................ 183
19.3.4.External CMOS Clock Mode .................................................................. 184
20.1.1.SmaRTClock Lock and Key Functions................................................... 189
20.1.2.Using RTC0ADR and RTC0DAT to Access SmaRTClock 
20.1.3.RTC0ADR Short Strobe Feature............................................................ 190
20.1.4.SmaRTClock Interface Autoread Feature .............................................. 190
20.1.5.RTC0ADR Autoincrement Feature......................................................... 191
20.2.1.Using the SmaRTClock Oscillator with a Crystal or 
20.2.2.Using the SmaRTClock Oscillator in Self-Oscillate Mode...................... 195
20.2.3.Using the Low Frequency Oscillator (LFO) ............................................ 195
20.2.4.Programmable Load Capacitance.......................................................... 196
20.2.5.Automatic Gain Control (Crystal Mode Only) and 
20.2.6.Missing SmaRTClock Detector .............................................................. 199
20.2.7.SmaRTClock Oscillator Crystal Valid Detector ...................................... 199
20.3.1.Setting and Reading the SmaRTClock Timer Value .............................. 199
20.3.2.Setting a SmaRTClock Alarm ................................................................ 200
20.3.3.Software Considerations for using the SmaRTClock Timer and Alarm . 200
21.1.1.Port Pins Configured for Analog I/O....................................................... 206
21.1.2.Port Pins Configured For Digital I/O....................................................... 206
21.1.3.Interfacing Port I/O to 5 V and 3.3 V Logic............................................. 207
21.1.4.Increasing Port I/O Drive Strength ......................................................... 207
21.2.1.Assigning Port I/O Pins to Analog Functions ......................................... 207
21.2.2.Assigning Port I/O Pins to Digital Functions........................................... 208
21.2.3.Assigning Port I/O Pins to External Digital Event Capture Functions .... 208
Internal Registers ................................................................................... 190
External CMOS Clock ............................................................................ 194
SmaRTClock Bias Doubling ................................................................... 197
Rev. 1.0