mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 488

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

External Signal Description
NVM Special Mode — An NVM mode enabling external, off-chip access to the memory
resources in the FTFL module. A reduced FTFL command set is available when the
MCU is secured. See the Chip Configuration details for information on when this mode is
used.
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 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.
Section Program Buffer — Lower half of the FlexRAM allocated for storing large
amounts of data for programming via the Program Section command.
Secure — An MCU state conveyed to the FTFL module as described in the Chip
Configuration details for this device. In the secure state, reading and changing NVM
contents is restricted.
23.2 External Signal Description
The FTFL module contains no signals that connect off-chip.
23.3 Memory Map and Registers
This section describes the memory map and registers for the FTFL module. Data read
from unimplemented memory space in the FTFL module is undefined. Writes to
unimplemented or reserved memory space (registers) in the FTFL module are ignored.
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
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Freescale Semiconductor, Inc.