XC888LM datasheet(27/144 Pages) INFINEON

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XC886/888CLM

Functional Description

Data Sheet

V0.9, 2006-12

3.2

Memory Organization

The XC886/888 CPU operates in the following five address spaces:

•

12 Kbytes of Boot ROM program memory

•

256 bytes of internal RAM data memory

•

1.5 Kbytes of XRAM memory

(XRAM can be read/written as program memory or external data memory)

•

A 128-byte Special Function Register area

•

24/32 Kbytes of Flash program memory (Flash devices); or

24/32 Kbytes of ROM program memory, with additional 4 Kbytes of Flash

(ROM devices)

Figure 7 illustrates the memory address spaces of the 32-Kbyte Flash devices. For the

24-Kbyte Flash devices, the shaded banks are not available.

Figure 7

Memory Map of XC886/888 Flash Device

For both 24-Kbyte and 32-Kbyte ROM devices, the last four bytes of the ROM from

7FFC

H to 7FFFH are reserved for the ROM signature and cannot be used to store user

0000

2000

4000

6000

F000

C000

F600

FFFF

7000

8000

P-Flash Banks 2 and 3

2 x 4 Kbytes

Boot ROM

12 Kbytes

XRAM

1.5 Kbytes

F000

F600

0000

FFFF

Special Function

Registers

Indirect

Address

Direct

Address

Program Space

External Data Space

Internal Data Space

Internal RAM

XRAM

1.5 Kbytes

Internal RAM

P-Flash Banks 0 and 1

2 x 4 Kbytes

D-Flash Bank 1

4 Kbytes

D-Flash Bank 0

4 Kbytes

A000

B000

D-Flash Bank 0

4 Kbytes

D-Flash Bank 1

4 Kbytes

5000

P-Flash Banks 4 and 5

2 x 4 Kbytes1)

In 24-Kbyte Flash devices, the upper 2-

Kbyte of Banks 4 and 5 are not available.

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