AT89C51CC03C-RDTIM datasheet(23/195 Pages) ATMEL

Il numero della parte	AT89C51CC03C-RDTIM

Spiegazioni elettronici	Enhanced 8-bit MCU with CAN Controller and Flash Memory

PDF	195 Pages

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Produttore elettronici	ATMEL [ATMEL Corporation]

Homepage	http://www.atmel.com

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AT89C51CC03

4182I–CAN–06/05

Data Memory

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

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

Upper

128 Bytes

Internal RAM

Lower

128 Bytes

Internal RAM

Special

Function

Registers

80h

00h

FFh

direct addressing

addressing

7Fh

direct or indirect

indirect addressing

256 up to 2048 Bytes

00h

64K Bytes

External XRAM

0000h

FFFFh

Internal ERAM

EXTRAM = 0

EXTRAM = 1

FFh or 7FFh

Internal

External

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