HC908LJ12AD/D

MC68HC08LJ12

Addendum to MC68HC908LJ12 Technical Data

MC68HC08LJ12

The MC68HC08LJ12 is the ROM part equivalent to the MC68HC908LJ12.

MCU Block Diagram

Figure 4 shows the block diagram of the MC68HC08LJ12.

Memory Map

The MC68HC08LJ128 has 12,288 bytes of user ROM from $C000 to $EFFF,

and 48 bytes of user ROM vectors from $FFD0 to $FFFF. On the

MC68HC908LJ12 these memory locations are FLASH memory.

Figure 5 shows the memory map of the MC68HC08LJ12.

Reserved Registers

The two registers at $FE08 and $FE09 are reserved locations on the

MC68HC08LJ12.

On the MC68HC908LJ12, these two locations are the FLASH control register

and the FLASH block protect register respectively.

Monitor ROM

The monitor program (monitor ROM: $FE10–$FFCF and $FC00–$FDFF) on

the MC68HC08LJ12 is for device testing only.

Table 8. Summary of MC68HC08LJ12 and MC68HC908LJ12 Differences

MC68HC08LJ12

MC68HC908LJ12

Operating voltages

—

5.0V

± 10%

3.3V

± 10%

5.0V

± 10%

Memory ($C000–$EFFF)

12,288 bytes ROM

12,288 bytes FLASH

User vectors ($FFD0–$FFFF)

48 bytes ROM

48 bytes FLASH

Registers at $FE08 and $FF09

Not used;

locations are reserved.

FLASH related registers.

$FE08 — FLCR

$FF09 — FLBPR

Monitor ROM

($FC00–$FDFF and $FE10–$FFCF)

Used for testing purposes only.

Used for testing and FLASH

programming/erasing.

Available packages

52-pin LQFP

64-pin LQFP

64-pin QFP

52-pin LQFP

64-pin LQFP

64-pin QFP

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com