Register Descriptions - NXP Semiconductors MKL27Z128VFM4 Reference Manual

Table of Contents

Memory Map and Registers

45.3.2.1 Program Once Field

The Program Once Field in the program flash IFR provides 64 bytes of user data storage

separate from the program flash main array. The user can program the Program Once

Field one time only as there is no program flash IFR erase mechanism available to the

user. The Program Once Field can be read any number of times. This section of the

program flash IFR is accessed in 4-byte records using the Read Once and Program Once

commands (see

Read Once Command

45.3.3 Register Descriptions

The flash memory module contains a set of memory-mapped control and status registers.

The FCCOB register group uses a big endian addressing convention. These registers can

be accessed as individual bytes, aligned 16-bit half-words or aligned 32-bit words. While

accessing these registers as half-words or words in a little endian system, ensure that the

correct order of the individual FCCOB registers is achieved.

While a command is running (FSTAT[CCIF]=0), register

writes are not accepted to any register except FCNFG and

FSTAT. The no-write rule is relaxed during the start-up reset

sequence, prior to the initial rise of CCIF. During this

initialization period the user may write any register. All register

writes are also disabled (except for registers FCNFG and

FSTAT) whenever an erase suspend request is active

(FCNFG[ERSSUSP]=1).

Flash Status Register (FTFA_FSTAT)

Flash Configuration Register (FTFA_FCNFG)

Flash Security Register (FTFA_FSEC)

Flash Option Register (FTFA_FOPT)

Flash Common Command Object Registers

(FTFA_FCCOB3)

FTFA memory map

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KL27 Sub-Family Reference Manual , Rev. 5, 01/2016

Program Once

Freescale Semiconductor, Inc.