ST7MC1K2 datasheet(195/371 Pages) STMICROELECTRONICS

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On-chip peripherals

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Z event detection

In sensorless mode, the Z window filter becomes active after each D event. It blanks out the

Z event during the time window defined by the ZWF[3:0] bits in the MZFR register (see

Table 86). The reset value is 200µs. This window filter becomes active after both hardware

and software D events.

The Z event filter becomes active after the Z window filter. It counts the number of

consecutive Z events up to a limit defined by the ZEF[3:0] bits in the MZFR register. The

reset value is 1. The Z bit is set when the counter limit is reached.

Sampling is done at a selectable frequency (fSCF), see Table 166.

The Z event filter is active only for a hardware Z event (ZH). For a simulated (ZS) event, it is

forced to 1. Z event filter is also active in sensor mode.

Figure 81.

Z window and event filter flowchart

1110

No D event filter

1111

Table 85.

D event filter setting (continued)

DEF3

DEF2

DEF1

DEF0

D event limit

SR = 1

End of

blanking

Z event?

Sampling

Limit = 1?

Reset counter

Increment counter

Set the Z bit

Counter = limit?

Yes

Window

filter

Event

filter

window?

Yes

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