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Peripheral Simulation

For Silicon Laboratories, Inc. C8051F061 — SMBus0 / I²C Interface

Simulation support for this peripheral or feature is comprised of:

  • Dialog boxes which display and allow you to change peripheral configuration.
  • VTREGs (Virtual Target Registers) which support I/O with the peripheral.

These simulation capabilities are described below.

SMBus0 Interface - Communications Dialog

SMBus0 Interface - Communications

The System Management Bus 0 Communication Dialog allows you to view the data sent or received on the SMBus0.

I²C Message Generator

  • Address contains address of the sending or receiving device.
  • Direction selects the direction of the message to be sent or received.
  • Bytes is the length of the last message in bytes.
  • Data is the message data sent or received.
  • Generate starts message transmission.
  • Stop suspends I²C bus communication.

SMBus0 Interface - Hardware Dialog

SMBus0 Interface - Hardware

The System Management Bus 0 Interface Dialog allows you to view and edit the SMBus0 simulator configuration. The SMBus0 is compatible with the I²C serial bus. Simulation of this interface is controlled by the following groups:

Control

  • SMB0CN (SMBus0 Control Register) contains the following bits that control the functions of the SMBus0:
  • BUSY (Busy Status Flag) is set when the SMBus0 is busy.
  • ENSMB (SMBus Enable) is set when the SMBus0 is enabled.
  • STA (SMBus Start Flag) is set when the SMBus0 has started a transmission as a master.
  • STO (SMBus Stop Flag) is set to send a stop condition on the SMBus.
  • SI (SMBus Serial Interrupt Flag) is set to trigger a SMBus0 interrupt.
  • AA (SMBus Assert Acknowledge Flag) is set to request that an acknowledge be returned during the acknowledge cycle.
  • FTE (SMBus Free Timer Enable Bit) is set to timeout when SCL high time exceeds limit specified by the SMB0CR value.
  • TOE (SMBus Timeout Enable Bit) is set to enable the SMBus0 timeout.

Clock

  • SMB0CR (SMBus0 Clock Rate Register) controls the frequency of the serial clock SCL in master mode.
  • I2C Master Clock is the master clock calculated from the system clock and the SMB0CR value.

Status

  • SMB0STA (SMBus0 Status Register) contains the 8-bit status code.
  • Device Mode displays the state of the SMBus0 controller.
  • Status a text description of the status code.

Address

  • SMB0ADR (SMBus0 Address Register) contains the following values:
  • Slave Address (SMBus0 Address Register) contains the slave address of the SMBus0 interface.
  • GC (General Call) is set when the general call address is recognized.

Data

  • SMB0DAT (SMB0 Data Register) contains the either the data to be transmitted or the data just received.

SMB0_CLK VTREG
Data Type: unsigned long

The SMB0_CLK VTREG specifies the clock frequency (in Hz) to use in SLAVE mode. 100000 specifies 100KHz.

SMB0_IN VTREG
Data Type: unsigned int

The SMB0_IN VTREG contains data sent from an SMBus0 or I²C peripheral to the simulated MCU.

  • 0x0000-0x00FF: An address or data byte transfer.
  • 0x0100: START byte. This initiates a SLAVE transmit or receive. The next byte sent is the address.
  • 0xFF00: ACK.
  • 0xFF01: NACK.
  • 0xFFFF: IDLE or STOP condition.

SMB0_OUT VTREG
Data Type: unsigned int

The SMB0_OUT VTREG contains data sent from the simulated MCU to an SMBus0 or I²C peripheral.

  • 0x0000-0x00FF: An address or data byte transfer.
  • 0x0100: START byte. This initiates a MASTER transmit or receive. The next byte sent is the address.
  • 0xFF00: ACK.
  • 0xFF01: NACK.
  • 0xFFFF: IDLE or STOP condition.
Get more information about the
Peripheral Simulation Capabilities
of the µVision Debugger.
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