The Z86C3X/C40 Consumer Controller Processors (CCP) are members of the Z8 single-chip microcontroller family offering a unique register-to-register architecture that avoids accumulator bottlenecks and offers fast execution of code. Three address spaces (Program Memory, Register File, and Expanded Register File [ERF]), support a wide range of memory configurations. Through the ERF, the designer has access to three additional control registers that provide extra peripheral devices, I/O ports, and register addresses. The rest of the ERF is not physically implemented and is open for future expansion. For applications demanding powerful I/O capabilities, the Z86C3X/C40's dedicated input and output lines are grouped into three and four ports, respectively, and are configurable under software control to provide timing, status signals, or parallel I/O.