Cypress MicroSystems Programmable System on Chip

　?。?a href='http://www.brongaenegriffin.com/tags/psoc/' target='_blank' class='arckwlink_none'>PSoC?） microcontroller provides highly flexible I/O with

　　every pin having configurable drive modes， interrupts and

　　global routing connections.

　　Assembly vs. C

　　Efficient software is vital for embedded system design，

　　especially with respect to I/O routines. PSoC MCU I/O

　　ports are highly configurable， and directly accessible by

　　firmware bit operations in PSoC Designer. This provides

　　maximum flexibility for programmers. However， it can

　　require code that is difficult to read

　　Consider this common example： A hardware engineer

　　wants to clear bit 6 of I/O port 0 （P0［6］）。 With a PSoC

　　microcontroller， they would write the following assembly

　　code：