MC9S12T64 Datasheet, PDF (236/608 Pages) Motorola, Inc – Specification

CALRAM 2K
Freescale Semiconductor, Inc.
Overview
The 2K byte CALRAM (Calibration RAM) module can overlap with the
Flash EEPROM array, and CPU can access data in the CALRAM
instead of in the Flash EEPROM array. During overlapping, the Flash
EEPROM array can be erased or programmed by entering the flash
super user mode.
The CALRAM may be read or written as either bytes, aligned words or
misaligned words. For compatibility with Flash EEPROM, access time is
one bus cycle for byte and aligned word accesses, and two bus cycles
for misaligned word accesses.
When the MCU is in the secured state and in the special single chip
mode, reading the CALRAM array returns $FFFF for any word accesses
or $FF for any byte accesses instead of returning actual values stored in
the array.
Features
• 2k bytes of CALRAM
– 2K byte calibration block over Flash EEPROM
– Access cycle compatible to Flash EEPROM
– Flash EEPROM erase or program possible while the CALRAM
overlaps with the Flash EEPROM
– Re-mappable to any 2K byte boundary
MC9S12T64Revision 1.1.1
CALRAM 2K
For More Information On This Product,
Go to: www.freescale.com