mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 436

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Appendix: MC68HC912DG128A EEPROM
22.5 Program/Erase Operation
22.6 Shadow Word Mapping
Technical Data
436
A program or erase operation should follow the sequence below if AUTO
bit is clear:
If AUTO bit is set, steps 4 and 5 can be replaced by a step to poll the
EEPGM bit until is cleared.
It is possible to program/erase more bytes or words without intermediate
EEPROM reads, by jumping from step 5 to step 2.
The shadow word is mapped to location $_FC0 and $_FC1 when the
NOSHW bit in EEMCR register is zero. The value in the shadow word is
loaded to the EEMCR, EEDIVH and EEDIVL after reset.
shows the mapping of each bit from shadow word to the registers
1. Reserved for testing. Must be set to one in user application.
2. Reserved. Must be set to one in user application for future compatibility.
1. Write BYTE, ROW and ERASE to desired value, write EELAT = 1
2. Write a byte or an aligned word to an EEPROM address
3. Write EEPGM = 1
4. Wait for programming,
5. Write EEPGM = 0
6. Write EELAT = 0
Freescale Semiconductor, Inc.
For More Information On This Product,
Appendix: MC68HC912DG128A EEPROM
Shadow word location
$_FC0, bit 3:2
$_FC0, bit 1:0
$_FC1, bit 7:0
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$_FC0, bit 6
$_FC0, bit 5
$_FC0, bit 4
$_FC0 bit 7
Table 22-4. Shadow word mapping
t
PROG
or erase,
t
ERASE
MC68HC912DG128 — Rev 3.0
EEMCR / NOBDML
EEMCR / NOSHW
EEMCR / bit 5
EEMCR / bit 4
EEDIVH / bit 1:0
EEMCR / bit 7:0
not mapped
Register / Bit
delay time (10ms)
Table 22-4
(2))
(1)
(1)
MOTOROLA