Datasheet
Table Of Contents
- RP2040 Datasheet
- Colophon
- Chapter 1. Introduction
- Chapter 2. System Description
- 2.1. Bus Fabric
- 2.2. Address Map
- 2.3. Processor subsystem
- 2.4. Cortex-M0+
- 2.5. DMA
- 2.6. Memory
- 2.7. Boot Sequence
- 2.8. Bootrom
- 2.9. Power Supplies
- 2.10. Core Supply Regulator
- 2.11. Power Control
- 2.12. Chip-Level Reset
- 2.13. Power-On State Machine
- 2.14. Subsystem Resets
- 2.15. Clocks
- 2.16. Crystal Oscillator (XOSC)
- 2.17. Ring Oscillator (ROSC)
- 2.18. PLL
- 2.19. GPIO
- 2.20. Sysinfo
- 2.21. Syscfg
- 2.22. TBMAN
- Chapter 3. PIO
- Chapter 4. Peripherals
- 4.1. USB
- 4.2. UART
- 4.3. I2C
- 4.3.1. Features
- 4.3.2. IP Configuration
- 4.3.3. I2C Overview
- 4.3.4. I2C Terminology
- 4.3.5. I2C Behaviour
- 4.3.6. I2C Protocols
- 4.3.7. Tx FIFO Management and START, STOP and RESTART Generation
- 4.3.8. Multiple Master Arbitration
- 4.3.9. Clock Synchronization
- 4.3.10. Operation Modes
- 4.3.11. Spike Suppression
- 4.3.12. Fast Mode Plus Operation
- 4.3.13. Bus Clear Feature
- 4.3.14. IC_CLK Frequency Configuration
- 4.3.15. DMA Controller Interface
- 4.3.16. Operation of Interrupt Registers
- 4.3.17. List of Registers
- 4.4. SPI
- 4.5. PWM
- 4.6. Timer
- 4.7. Watchdog
- 4.8. RTC
- 4.9. ADC and Temperature Sensor
- 4.10. SSI
- 4.10.1. Overview
- 4.10.2. Features
- 4.10.3. IP Modifications
- 4.10.4. Clock Ratios
- 4.10.5. Transmit and Receive FIFO Buffers
- 4.10.6. 32-Bit Frame Size Support
- 4.10.7. SSI Interrupts
- 4.10.8. Transfer Modes
- 4.10.9. Operation Modes
- 4.10.10. Partner Connection Interfaces
- 4.10.11. DMA Controller Interface
- 4.10.12. APB Interface
- 4.10.13. List of Registers
- Chapter 5. Electrical and Mechanical
- Appendix A: Register Field Types
- Appendix B: Errata
- Appendix C: Documentation Release History
Table 250.
FC0_REF_KHZ Register
Bits Description Type Reset
31:20 Reserved. - -
19:0 Reference clock frequency in kHz RW 0x00000
CLOCKS: FC0_MIN_KHZ Register
Offset: 0x84
Table 251.
FC0_MIN_KHZ
Register
Bits Description Type Reset
31:25 Reserved. - -
24:0 Minimum pass frequency in kHz. This is optional. Set to 0 if you are not using
the pass/fail flags
RW 0x0000000
CLOCKS: FC0_MAX_KHZ Register
Offset: 0x88
Table 252.
FC0_MAX_KHZ
Register
Bits Description Type Reset
31:25 Reserved. - -
24:0 Maximum pass frequency in kHz. This is optional. Set to 0x1ffffff if you are
not using the pass/fail flags
RW 0x1ffffff
CLOCKS: FC0_DELAY Register
Offset: 0x8c
Table 253. FC0_DELAY
Register
Bits Description Type Reset
31:3 Reserved. - -
2:0 Delays the start of frequency counting to allow the mux to settle
Delay is measured in multiples of the reference clock period
RW 0x1
CLOCKS: FC0_INTERVAL Register
Offset: 0x90
Table 254.
FC0_INTERVAL
Register
Bits Description Type Reset
31:4 Reserved. - -
3:0 The test interval is 0.98us * 2**interval, but let’s call it 1us * 2**interval
The default gives a test interval of 250us
RW 0x8
CLOCKS: FC0_SRC Register
Offset: 0x94
RP2040 Datasheet
2.15. Clocks 232