mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 82

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Electrically Erasable Programmable Read-Only Memory (EEPROM)
6.4.8 Low-Power Modes
6.4.8.1 Wait Mode
6.4.8.2 Stop Mode
Technical Data
80
NOTE:
Electrically Erasable Programmable Read-Only Memory (EEPROM)
EEBP3–EEBP0 — EEPROM Block Protection Bits
This subsection describes the low-power modes.
The WAIT instruction does not affect the EEPROM. It is possible to
program the EEPROM while the MCU is in wait mode. However, if the
EEPROM is inactive, power can be reduced by setting the EEOFF bit
before executing the WAIT instruction.
The STOP instruction reduces the EEPROM power consumption to a
minimum. The STOP instruction should not be executed while the high
voltage is turned on (EEPGM = 1).
If stop mode is entered while program/erase is in progress, high voltage
will be turned off automatically. However, the EEPGM bit will remain set.
When stop mode is terminated and if EEPGM is still set, the high voltage
will be turned back on automatically. Program/erase time will need to be
extended if program/erase is interrupted by entering stop mode.
The module requires a recovery time to stabilize after leaving stop mode.
Attempts to access the array during the recovery time will result in
unpredictable behavior.
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 EEBP3–EEBP0 from EENVR to
EEACR. See
1 = EEPROM array block protected
0 = EEPROM array block unprotected
6.4.3 EEPROM Block
Protection.
Freescale Semicon-
MC68HC08QA24