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Peripheral Simulation

For Atmel AT91SAM7S128 — Real-time Timer

Simulation support for this peripheral or feature is comprised of:

  • Dialog boxes which display and allow you to change peripheral configuration.

These simulation capabilities are described below.

Real-time Timer Dialog

Real-time Timer

The Real-time Timer Dialog shows the current state of the on-chip Real-time Timer. You can change Real-time Timer settings using the controls in this dialog.


  • RTT_MR (Mode Register) holds the parameters that control the timer. They are:
  • RTPRES (Real-time Prescaler Value) holds the number of SCLK periods (16-bits) required to increment the real-time timer.
  • RTTRST (Real-time Timer Restart) reloads and restarts the clock divider with a the new programmed value, and resets the 32-bit counter.
  • RTTINCIEN (Real-time Timer Increment Interrupt Enable) allows the RTTINC bit to trigger an interrupt.
  • ALMIEN (Alarm Interrupt Enable) allows the ALMS bit to trigger an interrupt.


  • RTT_AR (Alarm Register) holds the ALMV value.
  • ALMV (Alarm Value) defined the 32-bit alarm value compared to the Real-time Timer.


  • RTT_VR (Value Register) holds the CRTV value.
  • CRTV (Current Real-time Value) displays the current 32-bit real-time value.


  • RTT_SR (Status Register) holds the ALMS and the RTCINC values.
  • ALMS (Real-time Alarm Status) is set if an alarm has occurred since the last read of RTT_SR.
  • RTCINC (Real-time Timer Increment) is set if the Real-time Timer has been incremented since the last read of RTT_SR.
Get more information about the
Peripheral Simulation Capabilities
of the µVision Debugger.
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