Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

AN2326

Calibration software

5/20

Figure 3.

Basic software flowchart

1.3

Average version

This version uses the method described in Section 1.1 except it performs four measurements and uses

their average for each dichotomization step. It is useful when the mains is noisy. For instance, when a

motor starts it generates a tension pick and this can be considered as a mains edge.

This version is safer than the basic one but it requires more resources. It uses 136 bytes of program

memory and 11 bytes of RAM during calibration. The calibration takes less than 800 ms to be com-

pleted.

The average version works as shown in the following flowchart. The assembly code can be found in

Section 4.

Dichotomization

finished?

Initialization of Lite Timer

Measurement and

Increase RCCR

Decrease RCCR

Clock is set to 1 MHz

smaller

greater or equal

Compare

result with

reference

no

yes

calculation