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UM1540 Schematics Figure 29. JTAG interface 3V3 3V3 3V3 R16 10k PB3_TDO RESET# R19 10k R20 10k JTAG_20PIN R37 4k7 R38 4k7 R39 4k7 PA14_TCK R36 4k7 PA15_TDI PB4_NTRST PA15_TDI PA13_TMS PA14_TCK R18 10k PA13_TMS 1 3 5 7 9 11 13 15 17 19 PB4_NTRST J1 2 4 6 8 10 12 14 16 18 20 AM10182V1 Figure 30. Mode selection switch SW2 R15 100 2 PC5 1 3 C25 100nF MODE SELECTION SWITCH 3V3 R17 10k TP1 1 GND_T TP2 3V3 1 TEST POINT TEST POINT TP3 TP4 1 VDD_T TEST POINT 1 TEST POINT AM10183v1 Doc ID 023152 Rev 1 21/29