Raspberry Pi 3-pin Debug Connector Specification
■Raspberry Pi is standardising on using a small, keyed, 3-pin connector which can be used for either UART or 2-wire serial debug interfaces. Future Raspberry Pi devices with dedicated serial debug or UART interfaces will, where possible, use this connector and follow this specification.
■The oldest and most universal ‘debug’ port is a simple 16550-style UART. A UART requires 2 unidirectional pins, one to transmit data from the target to the host (TX) and one for the other direction (RX).
■The 3-pin serial debug connector interface is designed to work with a single unidirectional clock pin and a bidirectional data I/O pin. This arrangement can support ARM’s Serial Wire Debug (SWD) or things like cJTAG, for example.
■This document uses the words target and host to describe the debug target (e.g., a Raspberry Pi Pico) and debug host (the debug dongle, e.g., RP2040 running Picoprobe) respectively.
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Debug Connector 、 small, keyed, 3-pin connector 、 3-pin serial debug connector |
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2022/7/13 |
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189 KB |
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