MC68HC912DG128 Datasheet, PDF (123/452 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Flash Memory
Test Mode
7.13 Test Mode
The Flash EEPROM has some special test functions which are only
accessible when the device is in test mode. Test mode is indicated to the
Flash EEPROM module when the SMOD line on the LIB is asserted.
When SMOD is asserted, the special test control bits may be accessed
via the LIB to invoke the special test functions in the Flash EEPROM
module. When SMOD is not asserted, writes to the test control bits have
no effect and all bits in the test register FEETST will be cleared. This
ensures that Flash EEPROM test mode cannot be invoked inadvertently
during normal operation.
Note that the Flash EEPROM module will operate normally, even if
SMOD is asserted, until a special test function is invoked. The test mode
adds additional features over normal mode which allow the tests to be
performed even after the device is installed in the final product.
MC68HC912DG128 — Rev 3.0
MOTOROLA
Flash Memory
For More Information On This Product,
Go to: www.freescale.com
Technical Data
123