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External Signal Description
NVM — Nonvolatile memory. A memory technology that maintains stored data during
power-off. The flash array is an NVM using NOR-type flash memory technology.
NVM Normal Mode — An NVM mode that provides basic user access to flash memory
module resources. The CPU or other bus masters initiate flash program and erase
operations (or other flash commands) using writes to the FCCOB register group in the
flash memory module.
NVM Special Mode — An NVM mode enabling external, off-chip access to the memory
resources in the flash memory module. A reduced flash command set is available when
the MCU is secured. See the Chip Configuration details for information on when this
mode is used.
Program flash — The program flash memory provides nonvolatile storage for vectors
and 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 experiencing
errors upon readout. Since erased (1) states are subject to degradation just like
programmed (0) states, the data retention limit may be reached from the last erase
operation (not from the programming time).
RWW— Read-While-Write. The ability to simultaneously read from one memory
resource while commanded operations are active in another memory resource.
Secure — An MCU state conveyed to the flash memory module as described in the Chip
Configuration details for this device. In the secure state, reading and changing NVM
contents is restricted.
Word — 16 bits of data with an aligned word having byte-address[0] = 0.
45.2 External Signal Description
The flash memory module contains no signals that connect off-chip.
45.3 Memory Map and Registers
This section describes the memory map and registers for the flash memory module.
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
890
Freescale Semiconductor, Inc.
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