T89C51AC2-RLSI-M datasheet(30/117 Pages) ATMEL

部件名	T89C51AC2-RLSI-M

功能描述	8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM

PDF	117 Pages

Scroll/Zoom	100%

制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

标志

30 / 117 page

Draft.A - March 30, 2001

Preview - Confidential

T89C51AC2

8. Data Memory

8.1. Introduction

The T89C51AC2 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 1024 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 17 shows the internal and external data memory spaces organization.

Figure 17. Internal and External Data Memory Organization

256 up to 1024 bytes

Upper

128 bytes

Internal RAM

Lower

128 bytes

Internal RAM

Special

Function

Registers

80h

00h

FFh or 3FFh

FFh

00h

FFh

64 Kbytes

External XRAM

0000h

FFFFh

direct addressing

addressing

0100h up to 0400h

7Fh

Internal ERAM

direct or indirect

indirect addressing

EXTRAM= 0

EXTRAM= 1

T89C51AC2-RLSI-M 数据表(PDF) 30 Page - ATMEL Corporation

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