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Connection of Unused Pins

2.5 Connection of Unused Pins

The correct termination of all unused pins is listed in Table 2-3.

Table 2-3. Connection of Unused Pins

Pin Potential Comment

DVCC

DVSS

REF+

Open

eREF+

DVSS

REF-

eREF-

DVSS

For dedicated XIN pins only. XIN pins with shared GPIO functions should be

XIN DVCC

programmed to GPIO and follow Px.0 to Px.7 recomendations.

For dedicated XOUT pins only. XOUT pins with shared GPIO functions should be

XOUT Open

programmed to GPIO and follow Px.0 to Px.7 recomendations.

For dedicated X2IN pins only. X2IN pins with shared GPIO functions should be

XT2IN DVSS

programmed to GPIO and follow Px.0 to Px.7 recomendations.

For dedicated X2OUT pins only. X2OUT pins with shared GPIO functions should be

XT2OUT Open

programmed to GPIO and follow Px.0 to Px.7 recomendations.

Px.0 to Px.7 Open Switched to port function, output direction or input with pullup/pulldown enabled

RST/NMI DVCC or VCC 47 kΩ pullup with 10 nF (2.2 nF

(1)

) pulldown

Test Open 20xx, 21xx, 22xx devices

TDO Open

TDI Open

TMS Open

TCK Open

(1)

The pulldown capacitor should not exceed 2.2 nF when using devices with Spy-Bi-Wire interface in Spy-Bi-Wire mode or in 4-

wire JTAG mode with TI tools like FET interfaces or GANG programmers.

SLAU144J–December 2004–Revised July 2013 System Resets, Interrupts, and Operating Modes

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