68HC912DG128 Datasheet, PDF (404/424 Pages) Motorola, Inc – Advance Information

Appendix C: 68HC912DG128A EEPROM
NOTE:
When NOSHW cleared, the regular EEPROM array bytes at address
$0FC0 and $0FC1 are not visible. The SHADOW word is accessed
instead for both read and program/erase operations. Bits[7:4] from
the high byte of the SHADOW word, $0FC0, are loaded to
EEMCR[7:4]. Bits[1:0] from the high byte of the SHADOW word,
$0FC0,are loaded to EEDIVH[1:0]. Bits[7:0] from the low byte of the
SHADOW word, $0FC1,are loaded to EEDIVL[7:0]. BULK
program/erase only applies if SHADOW word is enabled.
Bit 6 from high byte of SHADOW word should not be programmed in
order to have the full EEPROM array visible.
NOTE:
EESWAI — EEPROM Stops in Wait Mode
0 = The module is not affected during WAIT mode
1 = The module ceases to be clocked during WAIT mode
Read and write anytime.
The EESWAI bit should be cleared if the WAIT mode vectors are
mapped in the EEPROM array.
PROTLCK — Block Protect Write Lock
0 = Block protect bits and bulk erase protection bit can be written
1 = Block protect bits are locked
Read anytime. Write once in normal modes (SMODN = 1), set and
clear any time in special modes (SMODN = 0).
DMY— Dummy bit
Read and write anytime.
68HC(9)12DG128 Rev 1.0
404
Appendix C: 68HC912DG128A EEPROM
6-eepromA
MOTOROLA