Datasheet

MSP430x22x2, MSP430x22x4
MIXED SIGNAL MICROCONTROLLER
SLAS504B − JULY 2006 − REVISED JULY 2007
68
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
Port P3 pin schematic: P3.0, input/output with Schmitt trigger
Bus
Keeper
EN
Direction
0: Input
1: Output
P3SEL.0
1
0
P3DIR.0
P3IN.0
D
EN
Module X IN
1
0
Module X OUT
P3OUT.0
P3.0/UC1STE/UC0CLK/A5
1
0
DVSS
DVCC
P3REN.0
ADC10AE0.5
Pad Logic
INCHx = 5
To ADC10
1
USCI Direction
Control
Port P3 (P3.0) pin functions
PIN NAME (P3 X)
X
Y
FUNCTION
CONTROL BITS / SIGNALS
PIN NAME (P3.X)
X Y FUNCTION
P3DIR.x P3SEL.x ADC10AE0.y
P3.0/ 0 5 P3.0† (I/O) I: 0; O: 1 0 0
UC1STE/UC0CLK/A5
UC1STE/UC0CLK (see Notes 3, 4) X 1 0
A5 (see Note 5) X 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. UC0CLK function takes precedence over UC1STE function. If the pin is required as UC0CLK input or output USCI1 will be forced
to 3-wire SPI mode if 4-wire SPI mode is selected.
5. Setting the ADC10AE0.y bit disables the output driver as well as the input schmitt trigger to prevent parasitic cross currents when
applying analog signals.