HC705MC4GRSSLASHD datasheet(28/180 Pages) NXP

28 / 180 page

Memory

MC68HC705MC4 — Rev. 2.0

Memory

2.3 User Mode Memory Map

When the MC68HC705MC4 is in the user mode, the 48 bytes of I/O

registers, 176 bytes of RAM, 3584 bytes of user EPROM, 240 bytes of

bootstrap ROM, and 16 bytes of user vectors EPROM are all active, as

shown in Figure 2-1. The MOR resides at address $0F00 (first byte of

the bootstrap code area) and the EPROM program register resides at

$0026.

$0000

I/O Registers

48 Bytes

I/O Registers

See Figure 2-2

$0000

$002F

$0030

Unused

$002F

$004F

$0050

Internal RAM

176 Bytes

$00BF

CTimer Vector (High Byte)/

COP Control Register

$0FF0

$00C0

Stack

64 Bytes

CTimer Vector (Low Byte)

$0FF1

$00FF

SCI Vector (High Byte)

$0FF2

$0100

User EPROM/ROM

3584 Bytes

SCI Vector (Low Byte)

$0FF3

Timer Vector 1 (High Byte)

$0FF4

Timer Vector 1 (Low Byte)

$0FF5

Timer Vector 2 (High Byte)

$0FF6

Timer Vector 2 (Low Byte)

$0FF7

$0EFF

Timer Vector 3 (High Byte)

$0FF8

$0F00

Mask Option Register

Timer Vector 3 (Low Byte)

$0FF9

$0F01

Bootstrap ROM

and Vectors

240 Bytes

IRQ Vector (High Byte)

$0FFA

IRQ Vector (Low Byte)

$0FFB

SWI Vector (High Byte)

$0FFC

$0FEF

SWI Vector (Low Byte)

$0FFD

$0FF0

User EPROM

Vectors — 16 Bytes

Reset Vector (High Byte)

$0FFE

$0FFF

Reset Vector (Low Byte)

$0FFF

Figure 2-1. User Mode Memory Map

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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