active medical device provided with a memory for storing holter data and control instructions of a microprocessor

The device has a piloting software stored in words of 2N bits of a sector (22), where each word has N bits of operation code forming command instruction of a central processing unit (14). A medical data is stored in words of 2N bits of another sector (24). An interface circuit (18) cooperates with the microprocessor and a RAM circuit (12) to read or write the words of the sectors according to a command sent by the processing unit. The RAM circuit has the sectors. The former sector has N bits of operation code forming command instruction of microprocessor, and n bits of detector and error code. The latter sector has N bits of higher order word and N bits of lower order word for storing elementary medical data.