MSP430FG47x
MIXED SIGNAL MICROCONTROLLER
SLAS580D -- OCTOBER 2008 -- REVISED MARCH 2011
75
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Port P3 pin schematic: P3.1 and P3.2, input/output with Schmitt trigger
Direction
0: Input
1: Output
P3SEL.x
P3DIR.x
P3IN.x
D
EN
Module X IN
Module X OUT
P3OUT.x
Pad Logic
1
0
1
0
P3.1/UCB0SIMO/UCB0SDA/S26
P3.2/UCB0SOMI/UCB0SCL/S27
Module
direction
Segment Sy
LCDS24
Bus
Keeper
EN
Port P3 (P3.1 and P3.2) pin functions
PIN NAME (P3 X)
X
FUNCTION
CONTROL BITS / SIGNALS
PIN NAME (P3.X)
X
FUNCTION
P3DIR.x
P3SEL.x
LCDS24
P3.1/UCB0SIMO/
1
P3.x (I/O)
I: 0, O: 1
0
0
/
/
UCB0SDA/S26
UCB0SIMO/UCB0SDA (see Notes 2 and 3)
x
1
0
S26
x
x
1
P3.2/UCB00SOMI/
2
P3.x (I/O)
I: 0, O: 1
0
0
/
/
UCB0SCL/S27
UCB0SOMI/UCB0SCL (see Notes 2 and 3)
x
1
0
S27
x
x
1
NOTES: 1. x: Don’t care.
2. The pin direction is controlled by the USCI module.
3. In case the I2C functionality is selected the output drives only the logical 0 to V
SS
level.
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