XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 96

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

EEPROM-1 Memory
Program/Erase
Using AUTO Bit
EEPROM-1
Programming
Technical Data
96
NOTE:
NOTE:
When this technique is utilized, a program/erase cycle is defined as
multiple program sequences (up to eight) to a unique location followed
by a single erase operation.
An additional feature available for EEPROM-1 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
on page 96,
Register
The unprogrammed or erase state of an EEPROM bit is a logic 1.
Programming changes the state to a logic 0. Only EEPROM bytes in the
non-protected blocks and the EE1NVR register can be programmed.
Use the following procedure to program a byte of EEPROM:
If using the AUTO mode, also set the AUTO bit during Step 1.
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-1 address will
be latched. If EELAT is set, other writes to the EE1CR will be allowed
after a valid EEPROM-1 write.
1. Clear EERAS1 and EERAS0 and set EELAT in the EE1CR.
2. Write the desired data to the desired EEPROM address.
3. Set the EEPGM bit.
4. Wait for time, t
5. Clear EEPGM bit.
6. Wait for time, t
7. Poll the EEPGM bit until it is cleared by the internal timer.
8. Clear EELAT bits.
Step 8.
on page 99 for more information.
EEPROM-1 Erasing
EEPROM-1 Memory
EEPGM
EEFPV
(E)
(C)
, for the programming voltage to fall. Go to
, to program the byte.
Go to Step 7 if AUTO is set.
on page 97 and
EEPROM-1 Programming
MC68HC908AZ60A — Rev 2.0
EEPROM-1 Control
MOTOROLA
(B)
(D)
(A)