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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP2120 датащи(PDF) 41 Page - Microchip Technology |
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MCP2120 датащи(HTML) 41 Page - Microchip Technology |
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41 / 64 page  2001 Microchip Technology Inc. DS51246A-page 37 MCP2120 Tutorial Figure 3.19: Debug Flowchart - MCP2120 Developer’s Board #1 Side Set up digital oscilloscope to capture waveform on first falling edge (Start bit) Debug Board #1 Type character in PC #1 Hyperterminal window Data appear on Yes No MCP2120 TX pin? Data appear on Yes No MCP2120 TXIR pin? Goto Debug Board #2 Problem with MCP2120 Verify device has power/ground Try replacing with new MCP2120 Data appear on Yes No MAX232 R1IN pin? Data appear on Yes No MAX232 R1OUT Verify 3 pin header J4 is jumpered correctly Verify that the connection from PC #1 to Board #1 is good. Try communication with another serial device (such as PICSTART Plus). Ensure jumper JP4 is open Ensure crystal oscillator is correct frequency and operating Ensure Baud Rate is correct (jumpers JP1, JP2, and JP3) MAX232 device It appears that the is damaged pin? |
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