Rainbow-electronics T89C51AC2 Manual de usuario descargar pdf (Pagina 31)

T89C51AC2

Rev. B – 19-Dec-01

Figure 10. External Code Fetch Waveforms

9.2 FLASH Memory

Architecture

T89C51AC2 features two on-chip flash memories:

• Flash memory FM0:

containing 32 Kbytes of program memory (user space) organized into 128 byte

pages,

• Flash memory FM1:

2 Kbytes for boot loader and Application Programming Interfaces (API).

The FM0 can be program by both parallel programming and Serial In-System Program-

ming (ISP) whereas FM1 supports only parallel programming by programmers. The ISP

mode is detailed in the "In-System Programming" section.

All Read/Write access operations on FLASH Memory by user application are managed

by a set of API described in the "In-System Programming" section.

Figure 11. Flash memory architecture

ALE

PSEN#

PCL

PCHPCH

PCLD7:0 D7:0

PCH

D7:0

CPU Clock

7FFFh

32 Kbytes

Flash memory

FM0

0000h

Hardware Security (1 byte)

Column Latches (128 bytes)

user space

Extra Row (128 bytes)

2Kbytes

Flash memory

FM1

boot space

FFFFh

F800h

FM1 mapped between FFFFh and

F800h when bit ENBOOT is set in

AUXR1 register

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 109 110

T89C51AC2 1

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics T89C51AC2 Manual de usuario Pagina 31

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics T89C51AC2