ZHCS136B November 2010 – June 2018 MSP430AFE221 , MSP430AFE222 , MSP430AFE223 , MSP430AFE231 , MSP430AFE232 , MSP430AFE233 , MSP430AFE251 , MSP430AFE252 , MSP430AFE253
PRODUCTION DATA.
Two I/O ports are implemented: 8-bit port P1 and 3-bit port P2.
Because there are only three I/O pins implemented from port P2, bits [5:1] of all port P2 registers read as 0, and write data is ignored.