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ST7MC1K2 数据表(PDF) 201 Page - STMicroelectronics |
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ST7MC1K2 数据表(HTML) 201 Page - STMicroelectronics |
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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. 2. Register updated on R 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 or or or 1 2 REO bit CS,H DS,H CPBn bit (1) Sample MPOL register MCRB register MPOL register PZ bit MCRA register To D detection ZS SZ bit Z=ZH and HZ bit + ZS and SZ bit ZH F(x) MTIM [8-bit up counter] (MSB) (2) ZS MZREG [Zn] (2) Compare 8 ZH SZ bit MCRC register MZFR register ZWF[3:0] SPLG bit DS[3:0] bits HZ bit MCRC register HZ bit ZH Z To interrupt generator MZFR register ZEF[3:0] ZWF[3:0] Obsolete Product(s) - Obsolete Product(s) |
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