Datasheet

MSP430x12x
MIXED SIGNAL MICROCONTROLLER
SLAS312C − JULY 2001 − REVISED SEPTEMBER 2004
31
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
input/output schematic (continued)
port P3, P3.2, input/output with Schmitt-trigger
P3.2/SOMI0
P3IN.2
Pad Logic
EN
D
P3OUT.2
P3DIR.2
P3SEL.2
0
1
0
1
DCM_SOMI
SYNC
MM
STE
STC
SO(MI)0
From USART0
(SO)MI0
To USART0
0: Input
1: Output
port P3, P3.3, input/output with Schmitt-trigger
P3.3/UCLK0
P3IN.3
Pad Logic
EN
D
P3OUT.3
P3DIR.3
P3SEL.3
UCLK.0
0
1
0
1
DCM_UCLK
SYNC
MM
STE
STC
From USART0
UCLK0
To USART0
0: Input
1: Output
NOTE: UART mode: The UART clock can only be an input. If UART mode and UART function are selected, the P3.3/UCLK0 is always
an input.
SPI, slave mode: The clock applied to UCLK0 is used to shift data in and out.
SPI, master mode: The clock to shift data in and out is supplied to connected devices on pin P3.3/UCLK0 (in slave mode).