Freescale Semiconductor, Inc.
November 5, 1998
GENERAL RELEASE SPECIFICATION
SECTION 2
MEMORY
The MC68HC05JB3 has 8k-bytes of addressable memory, with 64 bytes of I/O,
144 bytes of user RAM, and 2560 bytes of user ROM, as shown in Figure 2-1.
$0000
$0000
I/O Registers
64 Bytes
$003F
$0040
I/O Registers
64 Bytes
Unused
48 Bytes
$006F
$0070
$003F
$1FF0
User RAM
144 Bytes
Reserved
$00C0
Reserved
$1FF1
$1FF2
$1FF3
$1FF4
$1FF5
$1FF6
$1FF7
$1FF8
$1FF9
$1FFA
$1FFB
$1FFC
$1FFD
$1FFE
$1FFF
64 Byte Stack
$00FF
$0100
Reserved
Reserved
MFT Vector (High Byte)
MFT Vector (Low Byte)
Timer1 Vector (High Byte)
Timer1 Vector (Low Byte)
USB Vector (High Byte)
USB Vector (Low Byte)
IRQ Vector (High Byte)
IRQ Vector (Low Byte)
SWI Vector (High Byte)
SWI Vector (Low Byte)
Reset Vector (High Byte)
Reset Vector (Low Byte)
Unused
4864 Bytes
$13FF
$1400
User ROM
2560 Bytes
$1DFF
$1E00
Self-Check ROM
496 Bytes
$1FEF
$1FF0
User Vectors
16 Bytes
$1FFF
Figure 2-1. MC68HC05JB3 Memory Map
MC68HC05JB3
REV 1
MEMORY
MOTOROLA
2-1
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