Parallax Propeller - Package and I/O

Package and I/O

The initial version of the chip (called the P8X32) provides one 32 bit port in a 40-pin 0.6" DIP, 44-pin LQFP, or QFN package. Of the 40 available pins, 32 are used for I/O, four for power and ground pins, two for an external crystal (if used), one to enable brownout-detection, and one for reset.

All 8 cores can access the 32-bit port (designated "A"; there is currently no "B") simultaneously. A special control mechanism is used to avoid I/O conflicts if one core attempts to use an I/O pin as an output while another tries to use it as input. Any of these pins can be used for the timing or pulse-width modulation output techniques described above.

Parallax has stated that it expects later versions of the Propeller to offer more I/O pins and/or more memory.