Micro:bit test points

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Copyright © 2019–21 J. M. Spivey. All rights reserved.

Test points on the micro:bit board
 1 TMS  -- Debug interface for KL26
 2 TDO  --  "
 3 TDI  --  "
 4 TCLK --  "
 5 RST* --  "
 6 TGT_SWDIO
 7 TGT_SWCLK
 8 KL26 XTAL -- has 16MHz sine wave
 9 GND
10 VBUS_IF -- carries 5V when USB plugged in
11 USB-D+
12 USB-D-
13 VBAT
14 +V_TGT
15 TGT_TX -- UART transmit from nRF51
16 +3.3V_IF
17 TGT_RX -- UART receive from nRF51
18 VBAT
19 GND
20 TGT_RESET
21 GND
22 GND