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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC12F635E/SS датащи(PDF) 87 Page - Microchip Technology |
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PIC12F635E/SS датащи(HTML) 87 Page - Microchip Technology |
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87 / 196 page  © 2005 Microchip Technology Inc. Preliminary DS41232B-page 85 PIC12F635/PIC16F636/639 11.15 Configurable Output Enable Filter The purpose of this filter is to enable the LFDATA output and wake the microcontroller only after receiving a specific sequence of pulses on the LC input pins. Therefore, it prevents the AFE from waking up the microcontroller due to noise or unwanted input signals. The circuit compares the timing of the demodulated header waveform with a pre-defined value, and enables the demodulated LFDATA output when a match occurs. The output enable filter consists of a high (TOEH) and low duration (TOEL) of a pulse immediately after the AGC settling gap time. The selection of high and low times further implies a max period time. The output enable high and low times are determined by SPI interface programming. Figure 11-5 and Figure 11-6 show the output enable filter waveforms. There should be no missing cycles during TOEH. Missing cycles may result in failing the output enable condition. FIGURE 11-5: OUTPUT ENABLE FILTER TIMING Data Packet t ≥ TOEH t ≥ TOEL Required Output Enable Sequence LFDATA output is enabled on this rising edge t ≤ TOET Demodulator Output TGAP AFE Wake-up and AGC Stabilization Start bit AGC Gap Pulse (TAGC + TPAGC) TSTAB |
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