MC68HC908GT16 Datasheet, PDF (186/412 Pages) Motorola, Inc – Microcontrollers

FLASH Memory
Examples of protect start address:
BPR[7:0]
Start of Address of Protect Range
$00
The entire FLASH memory is protected.
$01 (0000 0001)
$C040 (1100 0000 0100 0000)
$02 (0000 0010)
$C080 (1100 0000 1000 0000)
and so on...
$FE (1111 1110)
$FF80 (1111 1111 1000 0000)
$FF
The entire FLASH memory is not protected.
Note: The end address of the protected range is always $FFFF.
11.8.2 ICG User Trim Registers (ICGTR5 and ICGTR3)
The ICG user trim register are two normal bytes of FLASH memory
which are allocated for the user to store copies of the ICG trim register
(ICGTR) value. ICGTR5 is allocated for storage of the trim value when a
5-V supply is used, ICGTR3 for storage of the trim value when a 3-V
supply is used. Representative trim values are programmed into these
locations by Motorola but they may be erased and reprogrammed by the
user at any time.
Storage and retrieval of data in these registers is not automatic and must
be performed programmatically. Typically, these locations are
programmed by the user during an in-system calibration procedure and
one of them, depending on the application supply voltage, is
subsequently used by the user’s initialization code to configure the ICG
each time following a reset.
ICGTR5 is used by the MC68HC908GT16 monitor ROM program during
its initialization sequence if monitor mode was entered while clocking
from the ICG. If the contents of ICGTR5 are not $FF then the contents
are copied to ICGTR.
NOTE: The contents of ICGTR3 are not utilized by the monitor ROM program.
Technical Data
186
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
FLASH Memory
MOTOROLA