MC68HC708AS48 datasheet(76/396 Pages) FREESCALE

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Electrically Erasable Programmable ROM

Advance Information

MC68HC708AS48 — Rev. 4.0

Electrically Erasable Programmable ROM (EEPROM)

MOTOROLA

6.4.7 EEPROM Non-Volatile Register and EEPROM Array Configuration Register

These registers configure the EEPROM array blocks for programming

purposes. EEACR loads its contents from the EENVR register at reset

and upon any read of the EENVR register.

EERA — EEPROM Redundant Array Bit

This programmable/erasable/readable bit in EENVR and read-only bit

in EEACR configures the array in redundant mode. Reset loads

EERA from EENVR to EEACR.

1 = EEPROM array in redundant mode configuration

0 = EEPROM array in normal mode configuration

EEBP2:EEBP0 — EEPROM Block Protection Bits

These programmable/erasable/readable bits in EENVR and

read-only bits in EEACR select blocks of EEPROM array from being

programmed or erased. Reset loads EEBP[2:0] from EENVR to

EEACR. See 6.4.3 EEPROM Block Protection.

1 = EEPROM array block protected

0 = EEPROM array block unprotected

Address:

$FE1F

Bit 7

654321

Bit 0

Read:

EERA

RRRR

EEBP2

EEBP1

EEBP0

Write:

RRRRRRRR

EENVR

= Reserved

Figure 6-2. EEPROM Array Control Register (EEACR)

Address:

$FE1C

Bit 7

654321

Bit 0

Read:

EERA

RRRR

EEBP2

EEBP1

EEBP0

Write:

Reset:

= Reserved

PV = Programmed value or 1 in the erased state.

Figure 6-3. EEPROM Non-Volatile Register (EENVR)

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