
EEPROM
Technical Data
MC68HC08AZ32A — Rev 1.0
74
EEPROM
MOTOROLA
5.6.5 EEPROM Timebase Divider Non-Volatile Register
The 16-bit EEPROM timebase divider non-volatile register consists of
two 8-bit registers: EEDIVHNVR and EEDIVLNVR. The contents of
these two registers are respectively loaded into the EEPROM timebase
divider registers, EEDIVH and EEDIVL, after a reset.
These two registers are erased and programmed in the same way as an
EEPROM byte.
These two registers are protected from erase and program operations if
the EEDIVSECD is set to logic 1 in the EEDIVH (see
EEPROM
Timebase Divider Register
) or programmed to a logic 1 in the
EEDIVHNVR.
NOTE:
Once EEDIVSECD in the EEDIVHNVR is programmed to 0 and after a
system reset, the EEDIV security feature is permanently enabled
because the EEDIVSECD bit in the EEDIVH is always loaded with 0
Address:
$FE10
Bit 7
6
5
4
3
2
1
Bit 0
Read:
EEDIVSECD
R
R
R
R
EEDIV10
EEDIV9
EEDIV8
Write:
Reset:
Unaffected by reset; $FF when blank
R
=Reserved
Figure 5-7. EEPROM Divider Non-Volatile Register High
(EEDIVHNVR))
Address:
$FE11
Bit 7
6
5
4
3
2
1
Bit 0
Read:
EEDIV7
EEDIV6
EEDIV5
EEDIV4
EEDIV3
EEDIV2
EEDIV1
EEDIV0
Write:
Reset:
Unaffected by reset; $FF when blank
Figure 5-8. EEPROM Divider Non-Volatile Register Low (EEDIVLNVR)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.