← back to legend
Communication buses
UART
Universal Asynchronous Receiver/Transmitter
2-wire serial (TX + RX), no shared clock, classic "serial console."
How it looks
Real geometry: CORE3588 copper, drawn from our board file (top and bottom layers; this net in amber)
The debug UART on CORE3588 (amber): plug a USB-serial cable into H4 and the computer module prints its boot messages.
- 1The 3-pin debug header H4: GND, and one pin each way.
- 2Two small buffer chips (U14, U15) and protection diodes between the header and the module.
- 3The computer module end.
Real image: CORE3588, rendered by KiCad from our board file
The header and its parts, rendered.
- 1H4, the debug header: three pins sticking up for a cable.
- 2D9, a protection diode on one data line.
How it works
Where it fits
Compare I2C and SPI, which share a clock wire. On CORE3588 its pins are guarded by TVS diodes.