mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 166

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

Boot
6.3.3 FOPT boot options
The flash option (FOPT) register in the flash memory module (FTFL) allows the user to
customize the operation of the MCU at boot time. The register contains read-only bits
that are loaded from the NVM's option byte in the flash configuration field. The user can
reprogram the option byte in flash to change the FOPT values that are used for
subsequent resets. For more details on programming the option byte (OPT field), refer to
the detailed description of the
The MCU uses the FTFL_FOPT register bits to configure the device at reset as shown in
the following table.
166
0
1
0
1
7-2
1
Bit Num
Mode select (BKGD/MS)
Mode select (EZP_MS)
Table 6-9. Flash Option Register (FTFL_FOPT) Bit Definitions
Table 6-7. BKGD/MS mode select decoding
Reserved
EZPORT_DIS
Table 6-8. EZP_MS mode select decoding
MCF51JF128 Reference Manual, Rev. 2, 03/2011
flash memory
Field
Table continues on the next page...
Preliminary
module.
Active background debug mode (BDM)
Single chip (default)
Serial flash programming mode (EzPort)
Single chip (default)
0
1
Value
Description
Description
Reserved for future
expansion.
EzPort operation is disabled.
If the device boots with the
EZP_MS signal low, then the
device boots in normal mode.
This mode might be desired if
the EZP_MS/IRQ pin is used
for its IRQ function.
EzPort operation is enabled.
The state of the EZP_MS pin
during reset determines
whether the device enters
EzPort mode.
Freescale Semiconductor, Inc.
Definition