M68HC08 datasheet(56/288 Pages) FREESCALE

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FLASH Memory

Data Sheet

MC68HC908BD48 — Rev. 2.1

FLASH Memory

Freescale Semiconductor

4.3 Functional Description

The FLASH memory is an array of 48,128 bytes with an additional 26

bytes of user vectors. An erased bit reads as logic 1 and a programmed

bit reads as a logic 0. Program and erase operations are facilitated

through control bits in a memory mapped FLASH control register

(FLCR). The address ranges for the user memory and vectors are:

•

$4000–$FBFF; user memory

•

$FE07; FLASH control register

•

$FE08; FLASH block protect register

•

$FFE6–$FFFF; these locations are reserved for user-defined

interrupt and reset vectors

Programming tools are available from Freescale . Contact your local

Freescale representative for more information.

4.4 FLASH Control Register (FLCR)

The FLASH control register (FLCR) controls FLASH program and erase

operations.

Address:

$FE07

Bit 7

654321

Bit 0

Read:

0000

HVEN

MASS

ERASE

PGM

Write:

Reset:

00000000

= Unimplemented

Figure 4-1. FLASH Control Register (FLCR)

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