MSP430F249-EP_14 Datasheet, PDF (68/82 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F249-EP
MIXED SIGNAL MICROCONTROLLER
2008
Port P3 pin schematic: P3.0 to P3.7, input/output with Schmitt trigger
Port P3.0 to P3.7 pin functions
PIN NAME (P3.X) X
FUNCTION
CONTROL BITS / SIGNALS
P3DIR.x
P3SEL.x
P3.0/UCB0STE/
UCA0CLK
0 P3.0 (I/O)
UCB0STE/UCA0CLK (see Notes 2 and 4)
I: 0; O: 1
0
X
1
P3.1/UCB0SIMO/
UCB0SDA
1 P3.1 (I/O)
UCB0SIMO/UCB0SDA (see Notes 2 and 3)
I: 0; O: 1
0
X
1
P3.2/UCB0SOMI/
UCB0SCL
2 P3.2 (I/O)
UCB0SOMI/UCB0SCL (see Notes 2 and 3)
I: 0; O: 1
0
X
1
P3.3/UCB0CLK/
UCA0STE
3 P3.3 (I/O)
UCB0CLK/UCA0STE (see Note 2)
I: 0; O: 1
0
X
1
P3.4/UCA0TXD/
UCA0SIMO
4 P3.4 (I/O)
UCA0TXD/UCA0SIMO (see Note 2)
I: 0; O: 1
0
X
1
P3.5/UCA0RXD/
UCA0SOMI
5 P3.5 (I/O)
UCA0RXD/UCA0SOMI (see Note 2)
I: 0; O: 1
0
X
1
P3.6/UCA1TXD^†/
UCA1SIMO^†
6 P3.6 (I/O)
UCA1TXD^†/UCA1SIMO^† (see Note 2)
I: 0; O: 1
0
X
1
P3.7/UCA1RXD^†/
UCA1SOMI^†
7 P3.7 (I/O)
UCA1RXD^†/UCA1SOMI^† (see Note 2)
I: 0; O: 1
0
X
1
† _{MSP430F24x and MSP430F24x1 devices only}
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.
4. UCA0CLK function takes precedence over UCB0STE function. If the pin is required as UCA0CLK input or output USCI A/B0 will
be forced to 3−wire SPI mode if 4−wire SPI mode is selected.
68
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265