Rainbow-electronics AT89C5132 Manual do Utilizador descarregar pdf (Página 3)

AT89C5132

4256A–USB–06/03

ISP Communication

Management

The purpose of this process is to manage the communication and its protocol between

the on-chip bootloader and an external device (host). The on-chip bootloader imple-

ments a USB protocol (see Section “Protocol”, page 10). This process translates serial

communication frames (USB) into Flash memory accesses (read, write, erase...).

User Call Management Several Application Program Interface (API) calls are available to the application pro-

gram to selectively erase and program Flash pages. All calls are made through a

common interface (API calls) included in the bootloader. The purpose of this process is

to translate the application request into internal Flash memory operations.

Flash Memory Management This process manages low level accesses to the Flash memory (performs read and

write accesses).

Bootloader Configuration

Configuration and

Manufacturer Information

The following table lists Configuration and Manufacturer byte information used by the

bootloader. This information can be accessed through a set of API or ISP commands.

Mapping and Default Value of

Hardware Security Byte

The 4 MSB of the Hardware Byte can be read/written by software (this area is called

Fuse bits). The 4 LSB can only be read by software and written by hardware using par-

allel programmer devices, this area is called Lock bits.

Note: U: Unprogrammed = 1

P: Program = 0

Table 1. Configuration and Manufacturer Byte Information

Mnemonic Description Default Value

BSB Boot Status Byte FFh

SBV Software Boot Vector FOh

SSB Software Security Byte FFh

EB Extra Byte FFh

Manufacturer 58h

Id1: Family Code D7h

Id2: Product Name F7h

Id3: Product Revision DFh

Table 2. Hardware Byte Information

Bit Position Mnemonic Default Value Description

7 X2B U To start in x1 mode

6 BLJB P To map the boot area in code area between F000h-FFFFh

5– U

4– U

3 reserved U

2LB2 P

To lock the chip (see datasheet)1LB1 U

0LB0 U

1 2 3 4 5 6 7 8 ... 30 31

Comentários a estes Manuais

Sem comentários

Rainbow-electronics AT89C5132 Manual do Utilizador Página 3

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics AT89C5132

Verwandte Produkte und Handbücher für Mikrowellen LG MS2342D