NXP Semiconductors freescale K51 Series Reference Manual

NVM Special Mode — An NVM mode enabling external, off-chip access to the memoryresources in the FTFL module. A reduced FTFL command set is available when theMCU is secured. See the Chip Configuration details for information on when this mode isused.Phrase — 64 bits of data with an aligned phrase having byte-address[2:0] = 000.Longword — 32 bits of data with an aligned longword having byte-address[1:0] = 00.Word — 16 bits of data with an aligned word having byte-address[0] = 0.Program flash — The program flash memory provides nonvolatile storage for vectorsand code store.Program flash Sector — The smallest portion of the program flash memory(consecutive addresses) that can be erased.Retention — The length of time that data can be kept in the NVM without experiencingerrors upon readout. Since erased (1) states are subject to degradation just likeprogrammed (0) states, the data retention limit may be reached from the last eraseoperation (not from the programming time).RWW— Read-While-Write. The ability to simultaneously read from one memoryresource while commanded operations are active in another memory resource.Section Program Buffer — Lower half of the programming acceleration FlexRAMallocated for storing large amounts of data for programming via the Program Sectioncommand.Secure — An MCU state conveyed to the FTFL module as described in the ChipConfiguration details for this device. In the secure state, reading and changing NVMcontents is restricted.28.2 External Signal DescriptionThe FTFL module contains no signals that connect off-chip.28.3 Memory Map and RegistersThis section describes the memory map and registers for the FTFL module. Data readfrom unimplemented memory space in the FTFL module is undefined. Writes tounimplemented or reserved memory space (registers) in the FTFL module are ignored.Chapter 28 Flash Memory Module (FTFL)K51 Sub-Family Reference Manual, Rev. 6, Nov 2011Freescale Semiconductor, Inc. 613