MSP430x22x2, MSP430x22x4
MIXED SIGNAL MICROCONTROLLER
SLAS504B − JULY 2006 − REVISED JULY 2007
70
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
Port P3 pin schematic: P3.6 to P3.7, input/output with Schmitt trigger
Bus
Keeper
EN
Direction
0: Input
1: Output
P3SEL.x
1
0
P3DIR.x
P3IN.x
D
EN
Module X IN
1
0
Module X OUT
P3OUT.x
P3.6/A6/OA0I2
P3.7/A7/OA1I2
1
0
DVSS
DVCC
P3REN.x
ADC10AE0.y
Pad Logic
INCHx = y
To ADC10
1
OA0/1
+
−
DVSS
Port P3 (P3.6, P3.7) pin functions
CONTROL BITS / SIGNALS
PIN NAME (P3.X)
X Y FUNCTION
P3DIR.x P3SEL.x ADC10AE0.y
P3.6/A6/OA0I2 6 6 P3.6† (I/O) I: 0; O: 1 0 0
A6/OA0I2 (see Note 5) X X 1
P3.7/A7/OA1I2 7 7 P3.7† (I/O) I: 0; O: 1 0 0
A7/OA1I2 (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. 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 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.
