MC908AS60ACFU Datasheet, PDF (93/414 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

EEPROM-2 Register Descriptions
AUTO — Automatic Termination of Program/Erase Cycle
When AUTO is set, EEPGM is cleared automatically after the program/erase cycle is terminated by
the internal timer.
(See note D for 7.4.5.2 EEPROM-2 Programming, 7.4.5.3 EEPROM-2 Erasing, and 28.1.13 EEPROM
Memory Characteristics)
1 = Automatic clear of EEPGM is enabled
0 = Automatic clear of EEPGM is disabled
EEPGM — EEPROM-2 Program/Erase Enable
This read/write bit enables the internal charge pump and applies the programming/erasing voltage to
the EEPROM-2 array if the EELAT bit is set and a write to a valid EEPROM-2 location has occurred.
Reset clears the EEPGM bit.
1 = EEPROM-2 programming/erasing power switched on
0 = EEPROM-2 programming/erasing power switched off
NOTE
Writing logic 0s to both the EELAT and EEPGM bits with a single instruction
will clear EEPGM only to allow time for the removal of high voltage.
7.5.2 EEPROM-2 Array Configuration Register
The EEPROM-2 array configuration register configures EEPROM-2 security and EEPROM-2 block
protection.
This read-only register is loaded with the contents of the EEPROM-2 nonvolatile register (EE2NVR) after
a reset.
Address: $FF7F
Bit 7
6
5
4
3
2
1
Bit 0
Read: UNUSED UNUSED UNUSED EEPRTCT EEBP3 EEBP2 EEBP1 EEBP0
Write:
Reset:
Contents of EE2NVR ($FF7C)
= Unimplemented
Figure 7-3. EEPROM-2 Array Configuration Register (EE2ACR)
Bit 7:5 — Unused Bits
These read/write bits are software programmable but have no functionality.
EEPRTCT — EEPROM-2 Protection Bit
The EEPRTCT bit is used to enable the security feature in the EEPROM (see EEPROM-2
Program/Erase Protection).
1 = EEPROM-2 security disabled
0 = EEPROM-2 security enabled
This feature is a write-once feature. Once the protection is enabled it may not be disabled.
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Freescale Semiconductor
93