System for limiting access to non-volatile memory in electronic postage meters

摘要: A method and associated apparatus for limiting the erasing writing of data in non-volatile memory (NVM) an electronic postage meter operated under microcomputer control to predetermined periods time after power up during down cycles meter, comprising steps providing output signal response establishment a voltage condition, generating pulse presence signal, presetting width provide sufficient erase desired words from NVM, applying bias enable NVM terminal duration pulse, enabling remaining terminals allow erasure removing interrupting operation removal ready at inception cycle, into period, biasing normal preclude NVM.