MSP430F21X2_17 Datasheet, PDF (61/80 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F21x2
www.ti.com
SLAS578J – NOVEMBER 2007 – REVISED JANUARY 2012
Port P3 Pin Schematic: P3.1 to P3.5, Input/Output With Schmitt Trigger
P3REN.x
P3DIR.x
0
Module
direction
1
Direction
0: Input
1: Output
DVSS 0
DVCC 1
Pad Logic
1
P3OUT.x
Module X OUT
P3SEL.x
P3IN.x
Module X IN
0
1
EN
D
Bus
Keeper
EN
P3.1/UCB0SIMO/UCB0SDA
P3.2/UCB0SOMI/UCB0SCL
P3.3/UCB0CLK/UCA0STE
P3.4/UCA0TXD/UCA0SIMO
P3.5/UCA0RXD/UCA0SOMI
Table 29. Port P3 (P3.1 to P3.5) Pin Functions
PIN NAME (P3.x)
x
FUNCTION
P3.1/UCB0SIMO/
UCB0SDA
P3.2/UCB0SOMI/
UCB0SCL
P3.3/UCB0CLK/
UCA0STE
P3.4/UCA0TXD/
UCA0SIMO
P3.5/UCA0RXD/
UCA0SOMI
P3.1 (I/O)
1
UCB0SIMO/UCB0SDA ^{(2) (3)}
P3.2 (I/O)
2
UCB0SOMI/UCB0SCL ^{(2) (3)}
P3.3 (I/O)
3
UCB0CLK/UCA0STE ⁽²⁾
P3.4 (I/O)
4
UCA0TXD/UCA0SIMO ⁽²⁾
P3.5 (I/O)
5
UCA0RXD/UCA0SOMI ⁽²⁾
(1) X = Don't care
(2) The pin direction is controlled by the USCI module.
(3) If the I2C functionality is selected, the output drives only the logical 0 to V_SS level.
CONTROL BITS / SIGNALS⁽¹⁾
P3DIR.x
P3SEL.x
I: 0; O: 1
0
X
1
I: 0; O: 1
0
X
1
I: 0; O: 1
0
X
1
I: 0; O: 1
0
X
1
I: 0; O: 1
0
X
1
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