Freescale Semiconductor, Inc.
Appendix: 68HC912D60A EEPROM
EEPROM Control Registers
Bits[7:4] are loaded at reset from the EEPROM SHADOW word.
NOTE: The bits 5 and 4 are reserved for test purposes. These locations in
SHADOW word should not be programmed otherwise some locations of
regular EEPROM array will not be visible.
NOBDML — Background Debug Mode Lockout Disable
0 = The BDM lockout is enabled.
1 = The BDM lockout is disabled.
Loaded from SHADOW word at reset.
Read anytime. Write anytime in special modes (SMODN=0).
NOSHW — SHADOW Word Disable
0 = The SHADOW word is enabled and accessible at address
$0FC0-$0FC1.
1 = Regular EEPROM array at address $0FC0-$0FC1.
Loaded from SHADOW word at reset.
Read anytime. Write anytime in special modes (SMODN=0).
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.
NOTE: Bit 6 from high byte of SHADOW word should not be cleared (set to '0')
in order to have the full EEPROM array visible. If Bit 6 from the high byte
of the SHADOW word is cleared then the following thirty bytes
$0FC2–$0FFF have no meaning and are reserved by Motorola.
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.
NOTE: The EESWAI bit should be cleared if the WAIT mode vectors are
mapped in the EEPROM array.
68HC(9)12D60 — Rev 4.0
MOTOROLA
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Appendix: 68HC912D60A EEPROM
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