Die 1xx Serie hat keine Pull-Ups, die Pinkompatiblen neueren Modelle aus
der 2xx Serie haben per software schaltbare
Pull-Up/Pull-Down-Widerstände.
Ob der Microcontroller deiner Wahl die Widerstände hat, kannst du im
Datenblatt unter short-form description – peripherals – digital IO
nachlesen.
MSP430F169 (Ohne Pull-Up/Down)
*All individual I/O bits are independently programmable.
*Any combination of input, output, and interrupt conditions is possible.
*Edge-selectable interrupt input capability for all the eight bits of
ports P1 and P2.
*Read/write access to port-control registers is supported by all
instructions.
MSP430F249 (Pinkompatibel, mit Pull-Up/Down)
* All individual I/O bits are independently programmable.
* Any combination of input, output, and interrupt conditions is
possible.
* Edge-selectable interrupt input capability for all eight bits of ports
P1 and P2.
* Read/write access to port-control registers is supported by all
instructions.
* Each I/O has an individually programmable pullup/pulldown resistor.
Gruß,
Florian