MC68HC08AZ60A Datasheet, PDF (86/480 Pages) Motorola, Inc – Microcontrollers

EEPROM-2
6.5.5.1 Program/Erase Using AUTO Bit
An additional feature available for EEPROM-2 program and erase
operations is the AUTO mode. When enabled, AUTO mode will activate
an internal timer that will automatically terminate the program/erase
cycle and clear the EEPGM bit. Please see EEPROM-2 Programming
on page 86, EEPROM-2 Erasing on page 87 and EEPROM-2 Control
Register on page 89 for more information.
6.5.5.2 EEPROM-2 Programming
The unprogrammed or erase state of an EEPROM-2 bit is a logic 1.
Programming changes the state to a logic 0. Only EEPROM-2 bytes in
the non-protected blocks and the EE2NVR register can be programmed.
Use the following procedure to program a byte of EEPROM-2:
1. Clear EERAS1 and EERAS0 and set EELAT in the EE2CR.^(A)
NOTE:
If using the AUTO mode, also set the AUTO bit during Step 1.
2. Write the desired data to the desired EEPROM-2 address.^(B)
3. Set the EEPGM bit.^(C) Go to Step 7 if AUTO is set.
4. Wait for time, t_EEPGM, to program the byte.
5. Clear EEPGM bit.
6. Wait for time, t_EEFPV, for the programming voltage to fall. Go to
Step 8.
7. Poll the EEPGM bit until it is cleared by the internal timer.^(D)
8. Clear EELAT bits.^(E)
NOTE:
A. EERAS1 and EERAS0 must be cleared for programming. Setting the
EELAT bit configures the address and data buses to latch data for
programming the array. Only data with a valid EEPROM-2 address will
be latched. If EELAT is set, other writes to the EE2CR will be allowed
after a valid EEPROM-2 write.
B. If more than one valid EEPROM-2 write occurs, the last address and
data will be latched overriding the previous address and data. Once data
Advance Information
86
EEPROM-2
MC68HC08AZ60A — Rev 0.0
MOTOROLA