MC68HC08AS20 Datasheet, PDF (68/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

6.4.7 EEPROM Nonvolatile 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.
Address: $FE1F
Bit 7
6
5
Read: EERA
R
R
Write: R
R
R
EENVR
R
R
R = Reserved
4
3
2
1
Bit 0
R
EEBP3 EEBP2 EEBP1 EEBP0
R
R
R
R
R
R
EENVR EENVR EENVR EENVR
Figure 6-2. EEPROM Array Control Register (EEACR)
Address:
Read:
Write:
Reset:
$FE1C
Bit 7
EERA
PV
6
5
R
R
R
R
= Unimplemented
4
3
2
1
Bit 0
R
EEBP3 EEBP2 EEBP1 EEBP0
R
PV
PV
PV
PV
R = Reserved
PV = Programmed value or 1 in the erased state.
Figure 6-3. EEPROM Nonvolatile Register (EENVR)
EERA — EEPROM Redundant Array Bit
This programmable/eraseable/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
EEBP3–EEBP0 — EEPROM Block Protection Bits
These programmable/eraseable/readable bits in EENVR and
read-only bits in EEACR select blocks of EEPROM array from being
programmed or erased. Reset loads EEBP[3:0] from EENVR to
EEACR. See 6.4.3 EEPROM Block Protection.
1 = EEPROM array block protected
0 = EEPROM array block unprotected
Advance Information
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MC68HC08AS20 —Rev. 4.1
Freescale Semiconductor