68HC705JB2 datasheet(21/128 Pages) NXP

21 / 128 page

August 28, 1998

GENERAL RELEASE SPECIFICATION

MEMORY

REV 1.1

2-1

SECTION 2

MEMORY

2.1

MEMORY MAP

The MC68HC705JB2 has an 8-Kbyte memory map consisting of user EPROM,

RAM, burn-in ROM, and input/output (I/O), as shown in Figure 2-1.

Figure 2-1. MC68HC705JB2 Memory Map

unimplemented

64 Bytes

5632

1535

8191

7679

User RAM

128 Bytes

Reset Vector (Low Byte)

Reset Vector (High Byte)

SWI Vector (Low Byte)

SWI Vector (High Byte)

IRQ Vector (Low Byte)

IRQ Vector (High Byte)

USB Vector (Low Byte)

USB Vector (High Byte)

$1FF7

$1FF8

$1FF9

$1FFA

$1FFB

$1FFC

$1FFD

$1FFE

$1FFF

$003F

$0000

$00FF

0255

I/O

64 Bytes

0064

0063

0000

$1FFF

$1FEF

$1600

$05FF

$0080

$007F

$0040

$003F

$0000

User EPROM

2048 Bytes

I/O

Registers

Total 64 bytes

(see Figure 2-2)

0128

0127

unimplemented

5276 Bytes

$1FF6

$1FF3

$1FF4

$1FF5

$1FF2

$1FF1

$1FF0

Reserved

$1DFF

$1E00

7680

8175

Bootstrap ROM

496 Bytes

Timer1 Vector (Low Byte)

MFT Vector (Low Byte)

Timer1 Vector (High Byte)

MFT Vector (High Byte)

Reserved

MOR Register

$01FF

EPROM Program Control

Reserved

$003E

$00C0

Stack

unimplemented

User Vectors

16 Bytes

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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