MSP430X22X2 Datasheet, PDF (69/87 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430x22x2, MSP430x22x4
MIXED SIGNAL MICROCONTROLLER
Port P3 pin schematic: P3.1 to P3.5, input/output with Schmitt trigger
SLAS504B − JULY 2006 − REVISED JULY 2007
P3REN.x
DVSS
Pad Logic
P3DIR.x
0
USCI Direction
1
Control
P3OUT.x
0
Module X OUT 1
P3SEL.x
P3IN.x
EN
Module X IN
D
Direction
0: Input
1: Output
DVSS 0
DVCC 1
1
Bus
Keeper
EN
P3.1/UC1SIMO/UC1SCL
P3.2/UC1SOMI/UC1SDA
P3.3/UC1CLK/UC0STE
P3.4/UC0TXD/UC0SIMO
P3.5/UC0RXD/UC0SOMI
Port P3 (P3.1 to P3.5) pin functions
PIN NAME (P3.X) X
FUNCTION
CONTROL BITS / SIGNALS
P3DIR.x
P3SEL.x
P3.1/
UC1SIMO/UC1SDA
1 P3.1† (I/O)
UC1SIMO/UC1SDA (see Note 3)
I: 0; O: 1
0
X
1
P3.2/
UC1SOMI/UC1SCL
1 P3.2† (I/O)
UC1SOMI/UC1SCL (see Note 3)
I: 0; O: 1
0
X
1
P3.3/
UC1CLK/UC0STE
1 P3.3† (I/O)
UC1CLK/UC0STE (see Notes 3, 4)
I: 0; O: 1
0
X
1
P3.4/
UC0TXD/UC0SIMO
1 P3.4† (I/O)
UC0TXD/UC0SIMO (see Note 3)
I: 0; O: 1
0
X
1
P3.5/
1 P3.5† (I/O)
I: 0; O: 1
0
UC0RXD/UC0SOMI
UC0RXD/UC0SOMI (see Note 3)
X
1
† _{Default after reset (PUC/POR)}
NOTES: 1. N/A: Not available or not applicable
2. X: Don’t care
3. The pin direction is controlled by the USCI module.
4. UC1CLK function takes precedence over UC0STE function. If the pin is required as UC1CLK input or output USCI0 will be forced
to 3-wire SPI mode even if 4-wire SPI mode is selected.
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