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Peripheral Simulation

For NXP (founded by Philips) P89LPC980 — 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.

I²C Interface Communication Dialog

I²C Interface Communication

The I²C Communication Dialog allows you to view the data sent or received on the I²C bus.

I²C Message Generator Group

  • 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.

To clear the message display, double-click anywhere in the message display area.

I²C Interface Hardware Dialog

I²C Interface Hardware

The I²C Hardware Interface dialog displays all configuration options for the on-chip I²C controller. You may interactively alter and view these options using the dialog controls.

I2C_CLK VTREG
Data Type: unsigned long

The I2C_CLK VTREG specifies the clock frequency (in Hz) to use in SLAVE mode. For example:

I2C_CLK = 100000

specifies a clock frequency of 100KHz.

I2C_IN VTREG
Data Type: unsigned int

The I2C_IN VTREG contains data sent from an I²C peripheral to the simulated MCU. The following values may be written to this register:

  • 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.

I2C_OUT VTREG
Data Type: unsigned int

The I2C_OUT VTREG contains data sent from the simulated MCU to the I²C peripheral. The following values are possible:

  • 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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