s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 61

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

5.5.5 EEPROM Timebase Divider Nonvolatile Register
The 16-bit EEPROM timebase divider nonvolatile 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
EEDIVHNVR.
5.6 Low-Power Modes
The WAIT and STOP instructions can put the MCU in low power-consumption standby modes.
5.6.1 Wait Mode
The WAIT instruction does not affect the EEPROM. It is possible to start the program or erase sequence
on the EEPROM and put the MCU in wait mode.
Freescale Semiconductor
Figure 5-7. EEPROM Divider Nonvolatile Register High (EEDIVHNVR))
Figure 5-8. EEPROM Divider Nonvolatile Register Low (EEDIVLNVR)
Address:
Address:
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 thereafter. Once
this security feature is armed, erase and program mode are disabled for
EEDIVHNVR and EEDIVLNVR. Modifications to the EEDIVH and EEDIVL
registers are also disabled. Therefore, care should be taken before
programming a value into the EEDIVHNVR.
Reset:
Reset:
Read:
Read:
Write:
Write:
EEPROM Timebase Divider
EEDIVS-
EEDIV7
$FE10
$FE11
ECD
Bit 7
Bit 7
R
= Reserved
EEDIV6
R
6
6
MC68HC908AZ32A Data Sheet, Rev. 2
EEDIV5
R
5
5
Unaffected by reset; $FF when blank
Unaffected by reset; $FF when blank
NOTE
Register) or programmed to a logic 1 in the
EEDIV4
R
4
4
EEDIV3
R
3
3
EEDIV10
EEDIV2
2
2
EEDIV9
EEDIV1
1
1
EEDIV8
EEDIV0
Bit 0
Bit 0
Low-Power Modes
61