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Input/output connectors
Freedom Board for Kinetis K28F (FRDM-K28F), User's Guide, Rev. 0, 04/2017
NXP Semiconductors
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18. Debug
The debug interface on the MK28FN2M0VMI15 MCU is the Serial Wire Debug (SWD) port with the
trace output capability. There are two debug interfaces on FRDM-K28F: the on-board OpenSDA v2.2
circuit (J12) and the K28F direct SWD connection via the 10-pin header (J23). To use an external
debugger (such as J-Link on J23), you may need to disconnect the OpenSDA v2.2 SWD circuit from the
K28F by removing jumpers J7 and J8.
19. Input/output connectors
The MK28FN2M0VMI15 MCU is packaged in the 169 MAPBGA package. Some pins are used in the
on-board circuitry, but some are connected directly to one of the four I/O headers (J1, J2, J3, and J4).
The pins on the K28F MCU are named after their General-Purpose Input/Output (GPIO) port pin
function. For example, the first pin on port A is referred to as PTA1. The name assigned to the I/O
connector pin corresponds to the GPIO pin of the K28F MCU.
Figure 18. FRDM-K28F I/O header pinout
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