ST7MC1K2 datasheet(201/371 Pages) STMICROELECTRONICS

201 / 371 page

Obsolete

Product(s)

- Obsolete

Product(s)

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

On-chip peripherals

201/371

Figure 83.

Z event generation

1. Preload register; changes taken into account at next C event.

Protection for ZH event detection

To avoid an erroneous detection of a hardware zero-crossing event, a filter can be enabled by setting the

PZ bit in the MCRA register. This filter ensures the detection of a ZH event on an edge transition between

D event and ZH event.

Without this protection, ZH event detection is done directly on the current sample in comparison with the

expected state at the output of the phase comparator. For example, if a falling edge transition (meaning a

transition from 1 to 0 at the output of the phase comparator) is configured for ZH event through the CPB

bit in MCRB register, then, the state 0 is expected at the comparator output and once this state is

detected, the ZH event is generated without any verification that the state at the comparator output of the

previous sample was 1. The purpose of this protection filter is to be sure that the state of the comparator

output at the sample before was really the opposite of the current state which is generating the ZH event.

With this filter, the ZH event generation is done on edge transition level comparison.

This filter is not needed in sensor mode (SR = 1) and for simulated zero-crossing event (ZS) generation.

When the PZ bit is set, the Z event filter ZEF[3:0] in the MZFR register is ignored.

ZVD bit

REO bit

CS,H

DS,H

CPBn bit

(1)

Sample

MPOL register

MCRB register

MPOL register

PZ bit

MCRA register

To D detection

SZ bit

Z=ZH and HZ bit + ZS and SZ bit

F(x)

MTIM [8-bit up counter] (MSB) (2)

MZREG [Zn]

(2)

Compare

SZ bit

MCRC register

MZFR register

ZWF[3:0]

SPLG bit

DS[3:0]

bits

HZ bit

MCRC register

HZ bit

To interrupt generator

MZFR register

ZEF[3:0]

ZWF[3:0]

Obsolete

Product(s)

- Obsolete

Product(s)

ST7MC1K2 bảng dữ liệu(PDF) 201 Page - STMicroelectronics

ST7MC1K2 bảng dữ liệu(HTML) 201 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL