Datasheet

MC68HC08JB8
Technical Data MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
270 MC68HC08JB8 Freescale Semiconductor
A.2 Introduction
This section introduces the MC68HC08JB8, the ROM part equivalent to
the MC68HC908JB8. The entire data book apply to this ROM device,
with exceptions outlined in this appendix.
A.3 MCU Block Diagram
Figure A-1 shows the block diagram of the MC68HC08JB8.
A.4 Memory Map
The MC68HC08JB8 has 8,192 bytes of user ROM from $DC00 to
$FBFF, and 16 bytes of user ROM vectors from $FFF0 to $FFFF. On the
MC68HC908JB8, these memory locations are FLASH memory.
Figure A-2 shows the memory map of the MC68HC08JB8.
Table A-1. Summary of MC68HC08JB8 and MC68HC908JB8 Differences
MC68HC08JB8 MC68HC908JB8
Memory ($DC00–$FBFF) 8,192 bytes ROM 8,192 bytes FLASH
User vectors ($FFF0–$FFFF) 16 bytes ROM 16 bytes FLASH
Registers at $FE08 and $FF09
Not used;
locations are reserved.
FLASH related registers.
$FE08 — FLCR
$FF09 — FLBPR
Monitor ROM
($FC00–$FDFF and $FE10–$FFDF)
$FC00–$FDFF: Not used.
$FE10–$FFDF: Used for
testing purposes only.
Used for testing and FLASH
programming/erasing.