AN2288

Software routines

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5.5

AVD interrupt routine

This routine is used to store accumulated kWh and tampering information to EEPROM

during power down.

Figure 20. AVD Interrupt power down routine

5.6

External interrupt routine

If the user wants to enter PC calibration mode, he should press the switch within ~30Sec of

start of the application. Application will enter into external interrupt routine by pressing the

external switch. Now external interrupt routine will wait for interrupt coming from PC GUI.

Figure 21. External interrupt routine

5.7

ART timer input capture interrupt routine

In this application, SCI is simulated using the 12-bit ART TImer. Different commands are

received by software SCI, and a response is sent back to the PC GUI using the ART timer

overflow interrupt.

end

AVD_Interrupt_Power_Down

Disable AVD interrupt

Write 4-bytes of kWh and

one byte of tampering infor-

mation to EEPROM

end

External Interrupt

Disable AVD interrupt

Wait for input capture inter-

rupt which is coming from

PC GUI