Shown here is the ADuC702x series memory model. All interaction between the ARM7TMDI core and the peripherals on-chip takes place through memory mapped registers (MMRs) which are located at the top of the memory map. Memory mapped registers are the equivalent of the Special Function Registers or SFRs which users of the 8052 based parts would be familiar with. For example, an ADC conversion can be started by setting a bit in the ADC control MMRs with the ADC result being available in the ADC data MMRs once the conversion is complete. All other peripherals can be accessed in a similar manner.