MSP430C33X_00 Datasheet, PDF (34/39 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLERS

MSP430C33x, MSP430P337A
MIXED SIGNAL MICROCONTROLLERS
SLAS227A – OCTOBER 1999 – REVISED JUNE 2000
typical input/output schematics (continued)
SYNC
MM
STC
STE
P4SEL.4
P4DIR.4
0
DCM_SIMO ₁
P4OUT.4
0
(SO) MI From USART
1
0: Input
1: Output
Pad Logic
VCC2
(see Note A)
(see Note B)
P4.4/SOMI
(see Note A)
P4IN.4
EN
(see Note B)
VSS3
(SO) MI To USART
D
A. Optional selection of pullup or pulldown resistors available on ROM (masked) versions.
B. Fuses for the optional pullup and pulldown resistors can only be programmed at the factory.
Figure 16. Port P4, P4.4, Input/Output With Schmitt-Trigger
SYNC
MM
STC
STE
P4SEL.5
P4DIR.5
0
DCM_UCLK 1
P4OUT.5
0
UCLK From USART
1
0: Input
1: Output
Pad Logic
DVCC
(see Note D)
(see Note E)
P4.5/UCLK
(see Note E)
P4IN.5
EN
(see Note D)
DVSS
UCLK To USART
D
Figure 17. Port P4, P4.5, Input/Output With Schmitt-Trigger
NOTES: A. UART mode: The clock can only be input if UART mode and UART function is selected, the direction of P4.5/UCLK is always input.
B. SPI, slave mode: The clock to UCLK is used to shift data in and out.
C. SPI, master mode: The clock shift data in and out is supplied on pin P4.5/UCLK for connected devices (in slave mode)
D. Optional selection of pullup or pulldown resistors available on ROM (masked) versions.
E. Fuses for the optional pullup and pulldown resistors can only be programmed at the factory.
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