The Z86C33/C43 Consumer Controller Processor (CCPTM) is a member of Zilog's Z8 single-chip microcontroller family with enhanced wake-up circuitry, programmable Watch-Dog Timers (WDT), and low-noise/EMI options. These enhancements result in a more efficient, costeffective design and provide the user with increased design flexibility over the standard Z8 microcontroller core. This low-power consumption CMOS microcontroller offers fast execution, efficient use of memory, sophisticated interrupts, input/output bit manipulation capabilities, and easy hardware/software system expansion. The Z86C33/C43 features an Expanded Register File (ERF) to allow access to register-mapped peripheral and I/O circuits. Four basic address spaces are available to support this wide range of configurations: Program Memory, Register File, Data Memory, and ERF. The Register File is composed of 236 bytes of general-purpose registers, four I/O port registers, and 15 control and status registers. The ERF consists of three control registers For applications demanding powerful I/O capabilities, the Z86C33 provides 24 pins, and the Z86C43 provides 32 pins dedicated to input and output. These lines are configurable under software control to provide timing, CP95DZ80202 9/95