s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 58

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

EEPROM
AUTO — Automatic termination of program/erase cycle
EEPGM — EEPROM Program/Erase Enable
5.5.2 EEPROM Array Configuration Register
The EEPROM array configuration register configures EEPROM security and EEPROM block protection.
This read-only register is loaded with the contents of the EEPROM nonvolatile register (EENVR) after a
reset.
Bit 7:5 — Unused Bits
EEPRTCT — EEPROM Protection Bit
EEBP[3:0] — EEPROM Block Protection Bits
58
When AUTO is set, EEPGM is cleared automatically after the program/erase cycle is terminated by
the internal timer.
(See note D for
EEPROM Memory
This read/write bit enables the internal charge pump and applies the programming/erasing voltage to
the EEPROM array if the EELAT bit is set and a write to a valid EEPROM location has occurred. Reset
clears the EEPGM bit.
These read/write bits are software programmable but have no functionality.
The EEPRTCT bit is used to enable the security feature in the EEPROM (see
Program/Erase
This feature is a write-once feature. Once the protection is enabled it may not be disabled.
These bits prevent blocks of EEPROM array from being programmed or erased.
See
1 = Automatic clear of EEPGM is enabled
0 = Automatic clear of EEPGM is disabled
1 = EEPROM programming/erasing power switched on
0 = EEPROM programming/erasing power switched off
1 = EEPROM security disabled
0 = EEPROM security enabled
1 = EEPROM array block is protected
0 = EEPROM array block is unprotected
Table
Address:
5-4.
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.
Reset:
Read: UNUSED
Write:
5.4.5.25.4.5.25.4.5.2 EEPROM
Protection).
Figure 5-3. EEPROM Array Configuration Register (EEACR)
Characteristics)
$FE1F
Bit 7
= Unimplemented
UNUSED
6
MC68HC908AZ32A Data Sheet, Rev. 2
UNUSED
5
Contents of EENVR ($FE1C)
EEPRTCT
NOTE
Programming,
4
EEBP3
3
5.4.5.3 EEPROM Erasing
EEBP2
2
EEBP1
1
5.4.3 EEPROM
Freescale Semiconductor
EEBP0
Bit 0
and
25.1.13