MC68HC08AZ32A Datasheet, PDF (49/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Electrically Erasable Programmable Read-Only Memory (EEPROM)
2.7.3.3 EEPROM Nonvolatile Register
The contents of this register is loaded into the EEPROM array configuration register (EEACR) after a
reset. This register is erased and programmed in the same way as an EEPROM byte. (See 2.7.3.1
EEPROM Control Register for individual bit descriptions).
Address:
Read:
Write:
Reset:
$FE1C
Bit 7
6
5
4
3
2
1
Bit 0
R
R
R
EEPRTCT EEBP3 EEBP2 EEBP1 EEBP0
PV
R
= Reserved
PV = Programmed value or 1 in the erased state.
Figure 2-6. EEPROM Nonvolatile Register (EENVR)
NOTE
The EENVR will leave the factory programmed with $F0 such that the full
array is available and unprotected.
2.7.3.4 EEPROM Timebase Divider Register
The 16-bit EEPROM timebase divider register consists of two 8-bit registers: EEDIVH and EEDIVL. The
11-bit value in this register is used to configure the timebase divider circuit to obtain the 35 µs timebase
for EEPROM control. These two read/write registers are respectively loaded with the contents of the
EEPROM timebase divider on volatile registers (EEDIVHNVR and EEDIVLNVR) after a reset.
Address: $FE1A
Bit 7
6
5
4
3
2
1
Read: _EEDIVS-
0
0
Write: ^ECD
0
0
EEDIV10 EEDIV9
Reset:
Contents of EEDIVHNVR ($FE10), Bits [6:3] = 0
= Unimplemented
Figure 2-7. EEDIV Divider High Register (EEDIVH)
Bit 0
EEDIV8
Address: $FE1B
Bit 7
6
5
4
3
2
1
Read:
Write:
Reset:
EEDIV7
EEDIV6
EEDIV5 EEDIV4 EEDIV3 EEDIV2
Contents of EEDIVLNVR ($FE11)
EEDIV1
Figure 2-8. EEDIV Divider Low Register (EEDIVL)
Bit 0
EEDIV0
EEDIVSECD — EEPROM Divider Security Disable
This bit enables/disables the security feature of the EEDIV registers. When EEDIV security feature is
enabled, the state of the registers EEDIVH and EEDIVL are locked (including the EEDIVSECD bit).
The EEDIVHNVR and EEDIVLNVR nonvolatile memory registers are also protected from being
erased/programmed.
1 = EEDIV security feature disabled
0 = EEDIV security feature enabled
MC68HC08AZ32A Data Sheet, Rev. 2
Freescale Semiconductor
49