8.12.4 I/O Lines Description

Table 8-19. I/O Lines Description
Name	Description	Type
PIOBU[0:3]	Parallel IO backup controller	I/O
TST	Test mode select. Must be connected to ground.	Input
JTAGSEL	JTAG selection	Input
TCK/SWCLK	Test clock/serial wire clock	Input
TMS/SWDIO	Test mode select/serial wire	I/O
XIN32	Slow clock oscillator input	Input
XOUT32	Slow clock oscillator output	Output

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