MC68HC908AT32 Datasheet, PDF (63/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

Functional Description
EEBP3–EEBP0 — EEPROM Block Protection Bits
These read/write bits select blocks of EEPROM array from being programmed or erased. Reset loads
EEBP[3:0] from EENVR to EEACR.
1 = EEPROM array block is protected.
0 = EEPROM array block is unprotected.
5.3.9 Low-Power Modes
The WAIT and STOP instructions can put the MCU in low-power standby modes.
5.3.9.1 Wait Mode
The WAIT instruction does not affect the EEPROM. It is possible to program the EEPROM and put the
MCU in wait mode. However, if the EEPROM is inactive, power can be reduced by setting the EEOFF bit
before executing the WAIT instruction.
5.3.9.2 Stop Mode
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 automatically turned off.
However, the EEPGM bit will remain set. When stop mode is terminated, and if EEPGM is still set, the
high voltage will be automatically turned back on. Program/erase time will need to be extended if
program/erase is interrupted by entering stop mode.
The module requires a recovery time, t_EESTOP, to stabilize after leaving stop mode. Attempts to access
the array during the recovery time will result in unpredictable behavior.
MC68HC908AT32 Data Sheet, Rev. 3.1
Freescale Semiconductor
63