By combining the flexibility of in-system programmable Flash memory, unobtrusive embedded emulation, and a common user interface, development time is reduced. Also, should the situation arise, last minute code updates as well as remote scheduled and unscheduled upgrades can also be made. Once the project is complete, access to the JTAG port can be permanently disabled using a non-erasable fuse. Spy Bi-Wire, which is another interface only available on new small pin count devices such as the F20xx and F22xx, offers the same real time embedded emulation support but only uses two wires instead of the usual four. This allows for more pins to be used for other functionality instead of being dedicated for debugging support.