The LPC810 is a Cortex-M0+ in a 8 pin PDIP.
PIO0_5 /RESET (o ) PIO0_0 U0_RXD PIO0_4 U0_TXD ( ) Vss PIO0_3 ( ) Vdd PIO0_2 ( ) PIO0_1 /ISPEN
See also the user manual.
Programming is over serial using lpc21isp.
The Sparkfun 3.3V FTDI cable is
Black GND (o Brown CTS ( Red VCC ( Orange TXD ( Yellow RXD ( Green RTS (
RTS is an output, CTS an input. The LPC needs /RST and /ISPEN which is tricky. Tie low for development as you can send the GO command to run the user code.