lPC-1600 80-Pin Headers P3 and P4
| PIN |
| SIGNAL NAME | ||
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| NUMBER |
| P4 CONNECTOR | P3 CONNECTOR | |
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| 01 |
| Data Terminal Ready 7 (DTR7) | Data Terminal Ready 15 (DTR15) | |
| 02 |
| Request To Send 5 (RTS5) | Request To Send 13 (RTS13) | |
| 03 |
| Request To Send 7 (RTS7) | Request To Send 15 (RTS15) | |
| 04 |
| Ring indicator 7 (RI7) | Ring Indicator 15 (R115) | |
| 05 |
| Clear To Send 8 (CTS8) | Clear To Send 16 (CTS16) | |
| 06 |
| Data Terminal Ready 5 (DTR5) | Data Terminal Ready 13 (DTR13) | |
| 07 |
| Data Carrier Detect 6 (DCD6) | Data Carrier Detect 14 (DCD14) | |
| 08 |
| Clear To Send 5 (CTS5) | Clear To Send 13 (CTS13) | |
| 09 |
| Data Carrier Detect 7 (DCD7) | Data Carrier Detect 15 (DCD15) | |
| 10 |
| Receive Data 6 (RD6) | Receive Data 14 (RD14) | |
| 11 |
| Data Carrier Detect 8 (DCD8) | Data Carrier Detect 16 (DCD16) | |
| 12 |
| Clear To Send 7 (CTS7) | Clear To Send 15 (CTS15) | |
| 13 |
| Clear To Send 6 (CTS6) | Clear To Send 14 (CTS14) | |
| 14 |
| Receive Data 8 (RD8) | Receive Data 16 (RD16) | |
| 15 |
| Data Carrier Detect 5 (DCD5) | Data Carrier Detect 13 (DCD13) | |
| 16 |
| Receive Data 7 (RD7) | Receive Data 15 (RD15) | |
| 17 |
| Request To Send 8 (RTS8) | Request To Send 16 (RTS16) | |
| 18 |
| Receive Data 5 (RD5) | Receive Data 13 (RD13) | |
| 19 |
| Data Terminal Ready 8 (DTR8) | Data Terminal Ready 16 (DTR16) | |
| 20 |
| Data Set Ready 5 (DSR5) | Data Set Ready 13 (DSR13) | |
| 21 |
| Transmit Data 5 (TD5) | Transmit Data 13 (TD13) | |
| 22 |
| Data Set Ready 7 (DSR7) | Data Set Ready 15 (DSR15) | |
| 23 |
| Transmit Data 7 (TD7) | Transmit Data 15 (TD15) | |
| 24 |
| Data Set Ready 8 (DSR8) | Data Set Ready 16 (DSR16) | |
| 25 |
| Ring Indicator 8 (RI8) | Ring Indicator 16 (RI16) | |
| 26 |
| Ground (GND) | Ground (GRD) | |
| 27 |
| Data Set Ready 6 (DSR6) | Data Set Ready 14 (DSR14) | |
| 28 |
| Ground (GND) | Ground (GRD) | |
| 29 |
| Transmit Data 8 (TD8) | Transmit Data 16 (TD16) | |
| 30 |
| Ground (GND) | Ground (GRD) | |
| 31 |
| Request To Send 6 (RTS6) | Request To Send 14 (RTS14) | |
| 32 |
| Ground (GND) | Ground (GRD) | |
| 33 |
| Ring Indicator 5 (RI5) | Ring Indicator 13 (RI13) | |
| 34 |
| Ground (GND) | Ground (GRD) | |
| 35 |
| Ring Indicator 6 (RI6) | Ring Indicator 14 (RI14) | |
| 36 |
| Ground (GND) | Ground (GRD) | |
| 37 |
| Transmit Data 6 (TD6) | Transmit Data 14 (TD14) | |
| 38 |
| Ground (GND) | Ground (GRD) | |
| 39 |
| Data Terminal Ready 6 (DTR6) | Data Terminal Ready 14 (DTR14) | |
| 40 |
| Ground (GND) | Ground (GRD) | |
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