Rainbow-electronics AT89C5132 Manual de usuario descargar pdf (Pagina 19)

AT8xC5132

4173A–8051–08/02

User Space This space is composed of a 64K Bytes ROM memory programmed during the manu-

facturing process. It contains the user’s application code.

Flash Memory

Architecture

As shown in Figure 13 the AT89C5132 Flash memory is composed of four spaces

detailed in the following paragraphs.

Figure 13. Flash Memory Architecture

User Space This space is composed of a 64K Bytes Flash memory organized in 512 pages of 128

Bytes. It contains the user’s application code. This space can be read or written by both

software and hardware modes.

Boot Space This space is composed of a 4K Bytes Flash memory. It contains the bootloader for In-

System Programming and the routines for In-System Application Programming.

This space can only be read or written by hardware mode using a parallel programming

tool.

Hardware Security Space This space is composed of one byte: the Hardware Security Byte (HSB see Table 21)

divided in two separate nibbles see Table 21. The MSN contains the X2 mode configu-

ration bit and the Boot Loader Jump Bit as detailed in section “Boot Memory Execution”

and can be written by software while the LSN contains the lock system level to protect

the memory content against piracy as detailed in section “Hardware Security System”

and can only be written by hardware.

FFFFh

64K Bytes

Flash Memory

0000h

Hardware Security

User

4K Bytes

Flash Memory

FFFFh

F000h

Boot

Extra Row

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Rainbow-electronics AT89C5132 Manual de usuario Pagina 19