MC908JB16DWE Datasheet, PDF (60/332 Pages) Freescale Semiconductor, Inc – Microcontrollers

FLASH Memory
Addr.
$FE08
$FE09
Register Name
Read:
FLASH Control Register
(FLCR)
Write:
Reset:
FLASH Block Protect ^Read:
Register Write:
(FLBPR) _Reset:
Bit 7
0
0
BPR7
0
6
5
0
0
0
0
BPR6 BPR5
0
0
= Unimplemented
4
0
0
BPR4
0
3
HVEN
0
BPR3
0
2
1
Bit 0
MASS ERASE PGM
0
0
0
BPR2 BPR1 BPR0
0
0
0
Figure 4-1. FLASH I/O Register Summary
4.3 Functional Description
The FLASH memory consists of an array of 16,384 bytes for user
memory plus a block of 48 bytes for user interrupt vectors. An erased bit
reads as logic 1 and a programmed bit reads as a logic 0. The FLASH
memory is block erasable. The minimum erase block size is 512 bytes.
Program and erase operation operations are facilitated through control
bits in FLASH Control Register (FLCR).The address ranges for the
FLASH memory are shown as follows:
• $BA00–$F9FF (user memory, 16,384 bytes)
• $FFD0–$FFFF (user interrupt vectors, 48 bytes)
NOTE:
Programming tools are available from Freescale. Contact your local
Freescale representative for more information.
A security feature prevents viewing of the FLASH contents.¹
Technical Data
60
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or
copying the FLASH difficult for unauthorized users.
FLASH Memory
MC68HC908JB16 — Rev. 1.1
Freescale Semiconductor