MSP430X20X1 Datasheet, PDF (58/80 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430x20x1, MSP430x20x2, MSP430x20x3
MIXED SIGNAL MICROCONTROLLER
SLAS491A − AUGUST 2005 − REVISED OCTOBER 2005
Port P1 (P1.3) pin schematics, MSP430x20x2
SREF2
To ADC 10 VR−
A3
0
VSS
1
INCHx = 3
ADC10AE.3
P1REN.3
Pad Logic
P1DIR.3
0
1
P1OUT.3
Module X OUT
P1SEL.3
P1IN.3
Module X IN
0
1
EN
D
Direction
0: Input
1: Output
DVSS 0
DVCC 1
1
Bus
Keeper
EN
P1.3/ADC10CLK/
A3/VREF−/VeREF−
P1IRQ.3
P1IE.3
P1IFG.3
EN
Q
Set
P1SEL.3
P1IES.3
Interrupt
Edge
Select
Port P1 (P1.0 to P1.3) pin functions, MSP430x20x2
PIN NAME (P1.X) X
FUNCTION
P1DIR.x
CONTROL BITS / SIGNALS
P1SEL.x
ADC10AE.x
INCHx
P1.3/ADC10CLK/
A3/VREF−/VeREF−
3 P1.3† Input/Output
N/A
0/1
0
0
1
0
N/A
0
N/A
ADC10CLK
1
1
0
N/A
A3 (see Note 3)
X
X
1
3
VREF−/VeREF− (see Notes 3, 4)
X
X
1
N/A
† _{Default after reset (PUC/POR)}
NOTES: 1. N/A: Not available or not applicable.
2. X: Don’t care.
3. Setting the ADC10AE.x bit disables the output driver as well as the input schmitt trigger to prevent parasitic cross currents when
applying analog signals.
4. An applied voltage is used as negative reference if bit SREF3 in register ADC10CTL0 is set.
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