C8051F360 datasheet(86/288 Pages) SILABS

86 / 288 page

C8051F360/1/2/3/4/5/6/7/8/9

Rev. 1.0

9.4.

Memory Organization

The memory organization of the CIP-51 System Controller is similar to that of a standard 8051. There are

two separate memory spaces: program memory and data memory. Program and data memory share the

same address space but are accessed via different instruction types. There are 256 bytes of internal data

memory and 32k bytes (C8051F360/1/2/3/4/5/6/7) or 16k bytes (C8051F368/9) of internal program mem-

ory address space implemented within the CIP-51. The CIP-51 memory organization is shown in

Figure 9.2.

FLASH

(In-System

Programmable in 1024

Byte Sectors)

PROGRAM MEMORY

0x0000

(Direct and Indirect

Addressing)

0x00

0x7F

Upper 128 RAM

(Indirect Addressing

Only)

0x80

0xFF

Special Function

(Direct Addressing Only)

RESERVED

0x7C00

0x7BFF

DATA MEMORY

General Purpose

Registers

0x1F

0x20

0x2F

Bit Addressable

Lower 128 RAM

(Direct and Indirect

Addressing)

0x30

C8051F360/1/2/3/4/5/6/7

FLASH

(In-System

Programmable in 1024

Byte Sectors)

0x0000

0x4000

0x3FFF

C8051F368/9

EXTERNAL DATA ADDRESS SPACE

INTERNAL DATA ADDRESS SPACE

XRAM - 1024 Bytes

(accessable using MOVX

instruction)

0x0000

0x03FF

Same 1024 bytes as from

0x0000 to 0x03FF, wrapped

on 1024-byte boundaries

0x0400

0xFFFF

RESERVED

Figure 9.2. Memory Map

9.4.1. Program Memory

The CIP-51 core has a 64 kB program memory space. The C8051F360/1/2/3/4/5/6/7 implement 32 kB of

this program memory space as in-system, re-programmable Flash memory, organized in a contiguous

block from addresses 0x0000 to 0x7BFF. Addresses above 0x7BFF are reserved on the 32 kB devices.

The C8051F368/9 implement 16 kB of Flash from addresses 0x0000 to 0x3FFF.

Program memory is normally assumed to be read-only. However, the CIP-51 can write to program memory

by setting the Program Store Write Enable bit (PSCTL.0) and using the MOVX instruction. This feature pro-

vides a mechanism for the CIP-51 to update program code and use the program memory space for non-

volatile data storage. Refer to Section “13. Flash Memory” on page 135 for further details.

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