ST72C334J4TAE STMicroelectronics, ST72C334J4TAE Datasheet - Page 21

• Manufacturer Part Number: ST72C334J4TAE
• Description: 8-bit MCU for automotive with single voltage Flash/ROM memory, ADC, 16-bit timers, SPI, SCI interfaces
• Manufacturer: STMicroelectronics

DATA EEPROM (Cont’d)
6.4 POWER SAVING MODES
Wait mode
The Data EEPROM can enter Wait mode on exe-
cution of the WFI instruction of the microcontroller.
The Data EEPROM will immediately enter this
mode if there is no programming in progress, oth-
erwise the Data EEPROM will finish the cycle and
then enter Wait mode.
Halt mode
The Data EEPROM immediately enters Halt mode
if the microcontroller executes the HALT instruc-
tion. Therefore the EEPROM will stop the function
in progress, and data may be corrupted.
Figure 8. Data EEPROM Programming Cycle
INTERNAL
PROGRAMMING
VOLTAGE
DATA LATCHES
WRITE OF
ERASE CYCLE
READ OPERATION NOT POSSIBLE
ST72334xx-Auto, ST72314xx-Auto, ST72124Jx-Auto
t
PROG
6.5 ACCESS ERROR HANDLING
If a read access occurs while LAT=1, then the data
bus will not be driven.
If a write access occurs while LAT=0, then the
data on the bus will not be latched.
If a programming cycle is interrupted (by software/
RESET action), the memory data will not be guar-
anteed.
WRITE CYCLE
READ OPERATION POSSIBLE
EEPROM INTERRUPT
21/150
PGM
LAT