MSP430F551X Datasheet, PDF (83/115 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

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Port P5, P5.0 and P5.1, Input/Output With Schmitt Trigger
to/from Reference
(n/a MSP430F551x)
(n/a MSPF430F551x)
to ADC12
(n/a MSPF430F551x)
INCHx = x
P5REN.x
MSP430F551x
MSP430F552x
SLAS590D – OCTOBER 2009 – REVISED APRIL 2010
Pad Logic
P5DIR.x
0
1
DV_SS
0
DV_CC
1
1
P5OUT.x
From module
P5SEL.x
P5IN.x
To module
0
1
EN
D
P5DS.x
0: Low drive
1: High drive
Bus
Keeper
P5.0/(A8/VREF+/VeREF+)
P5.1/(A9/VREF–/VeREF–)
PIN NAME (P5.x)
P5.0/A8/VREF+/VeREF+ ⁽²⁾
P5.1/A9/VREF–/VeREF– ⁽⁶⁾
Table 52. Port P5 (P5.0 and P5.1) Pin Functions
x
0 P5.0 (I/O)⁽³⁾
A8/VeREF+ ⁽⁴⁾
A8/VREF+ ⁽⁵⁾
1 P5.1 (I/O)⁽³⁾
A9/VeREF– ⁽⁷⁾
A9/VREF– ⁽⁸⁾
FUNCTION
CONTROL BITS/SIGNALS⁽¹⁾
P5DIR.x
P5SEL.x
REFOUT
I: 0; O: 1
0
X
X
1
0
X
1
1
I: 0; O: 1
0
X
X
1
0
X
1
1
(1) X = Don't care
(2) VREF+/VeREF+ available on MSP430F552x devices only.
(3) Default condition
(4) Setting the P5SEL.0 bit disables the output driver as well as 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.
(5) Setting the P5SEL.0 bit disables the output driver as well as 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.
(6) VREF-/VeREF- available on MSP430F552x devices only.
(7) Setting the P5SEL.1 bit disables the output driver as well as 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 as well as 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.
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