Figure 9-6 shows the port diagram. Table 9-50 summarizes the selection of the pin function.
Table 9-50 Port P5 (P5.0 and P5.1) Pin FunctionsPIN NAME (P5.x) | x | FUNCTION | CONTROL BITS OR SIGNALS(3) |
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P5DIR.x | P5SEL.x | REFOUT |
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P5.0/A8/VREF+/VeREF+(1) | 0 | P5.0 (I/O)(4) | I: 0; O: 1 | 0 | X |
A8/VeREF+(5) | X | 1 | 0 |
A8/VREF+(6) | X | 1 | 1 |
P5.1/A9/VREF-/VeREF-(2) | 1 | P5.1 (I/O)(4) | I: 0; O: 1 | 0 | X |
A9/VeREF–(7) | X | 1 | 0 |
A9/VREF–(8) | X | 1 | 1 |
(1) VREF+/VeREF+ available on MSP430F552x devices only.
(2) VREF-/VeREF- available on MSP430F552x devices only.
(3) X = Don't care
(4) Default condition
(5) Setting the P5SEL.0 bit disables the output driver and the input Schmitt trigger to prevent parasitic cross currents when applying analog signals. An external voltage can be applied to VeREF+ and used as the reference for the ADC12_A when available. Channel A8, when selected with the INCHx bits, is connected to the VREF+/VeREF+ pin.
(6) Setting the P5SEL.0 bit disables the output driver and the input Schmitt trigger to prevent parasitic cross currents when applying analog signals. The VREF+ reference is available at the pin. Channel A8, when selected with the INCHx bits, is connected to the VREF+/VeREF+ pin.
(7) Setting the P5SEL.1 bit disables the output driver and the input Schmitt trigger to prevent parasitic cross currents when applying analog signals. An external voltage can be applied to VeREF- and used as the reference for the ADC12_A when available. Channel A9, when selected with the INCHx bits, is connected to the VREF-/VeREF- pin.
(8) Setting the P5SEL.1 bit disables the output driver and the input Schmitt trigger to prevent parasitic cross currents when applying analog signals. The VREF– reference is available at the pin. Channel A9, when selected with the INCHx bits, is connected to the VREF-/VeREF- pin.