dsp存储器英文文献及翻译dsp存储器英文文献及翻译the ROM.ROM/RAM security option. This option is the most secure, because it protects both the on-chip ROM and the on-chip RAM. When the ROM/RAM security option is enabled, any instruction fetched from external memory is prohibited from accessing on-chip ROM or RAM and reads invalid data (0FFFFh). Only instructions fetched from on-chip ROM or on-chip RAM can access the on-chip memory. The ROM/RAM security option also internally forces the device into microcomputer