The Motorola MMDS and MMEVS development systems give embedded systems developers the ability to emulate members of the M68HC05 Family of microcontroller units. The MMDS/MMEVS host software command set provides users with read and write access to an emulated MCU’s on-chip registers and peripherals. The design of some HC05 peripherals, however, precludes their being directly accessed by the MMDS/MMEVS. An example of such a peripheral is the personality EEPROM (PEEPROM) found on MC68HC(8)05K3 microcontrollers.