FTS64K datasheet(22/44 Pages) FREESCALE

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FTS64K Block User Guide — Version V01.00

3.3.4 FCNFG — Flash Configuration Register

The FCNFG register enables the Flash interrupts and gates the security backdoor writes.

Figure 3-5 Flash Configuration Register (FCNFG)

CBEIE, CCIE and KEYACC are readable and writable. Bits 4-0 read zero and are not writable.

CBEIE — Command Buffer Empty Interrupt Enable.

The CBEIE bit enables the interrupts in case of an empty command buffer in the Flash.

1 = An interrupt will be requested whenever the CBEIF flag, Figure 3-7, is set.

0 = Command Buffer Empty interrupts disabled.

CCIE — Command Complete Interrupt Enable.

The CCIE bit enables the interrupts in case of all commands being completed in the Flash.

1 = An interrupt will be requested whenever the CCIF, Figure 3-7, flag is set.

0 = Command Complete interrupts disabled.

KEYACC — Enable Security Key Writing.

1 = Writes to Flash array are interpreted as keys to open the backdoor. Reads of the Flash array

return invalid data.

0 = Flash writes are interpreted as the start of a program or erase sequence.

3.3.5 FPROT — Flash Protection Register

The FPROT register defines which Flash sectors are protected against program or erase.

Figure 3-6 Flash Protection Register (FPROT)

76543210

CBEIE

CCIE

KEYACC

00000

Reset:

00000000

= Unimplemented or Reserved

76543210

FPOPEN

NV6

FPHDIS

FPHS1

FPHS0

FPLDIS

FPLS1

FPLS0

Reset:

FFFFFFFF

= Unimplemented or Reserved

Freescale Semiconductor, Inc.

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