AT89C51CC03C-RLTIM View Datasheet(PDF) - Atmel Corporation

Part Name

Description

MFG CO.

AT89C51CC03C-RLTIM

Enhanced 8-bit MCU with CAN Controller and Flash Memory

Atmel Corporation 

Data Memory

AT89C51CC03

The AT89C51CC03 provides data memory access in two different spaces:

1. The internal space mapped in three separate segments:

• the lower 128 Bytes RAM segment.

• the upper 128 Bytes RAM segment.

• the expanded 2048 Bytes RAM segment (ERAM).

2. The external space.

A fourth internal segment is available but dedicated to Special Function Registers,

SFRs, (addresses 80h to FFh) accessible by direct addressing mode.

Figure 8 shows the internal and external data memory spaces organization.

Figure 7. Internal Memory - RAM

FFh

Upper

128 Bytes

Internal RAM

indirect addressing

80h

7Fh

Lower

128 Bytes

Internal RAM

direct or indirect

addressing

00h

FFh

Special

Function

Registers

direct addressing

80h

Figure 8. Internal and External Data Memory Organization ERAM-XRAM

FFFFh

64K Bytes

External XRAM

FFh or 7FFh

256 up to 2048 Bytes

Internal ERAM

EXTRAM = 0

00h

Internal

EXTRAM = 1

0000h

External

23

4182K–CAN–05/06

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