T89C51RD2-RDTIL datasheet(63/104 Pages) ATMEL

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T89C51RD2

4243G–8051–05/03

ISP Protocol Description

Physical Layer

The UART used to transmit information has the following configuration:

•

Character: 8-bit data

•

Parity: none

•

Stop: 1 bit

•

Flow control: none

•

Baud rate: autobaud is performed by the bootloader to compute the baud rate

choosen by the host.

Frame Description

The Serial Protocol is based on the Intel Hex-type records.

Intel Hex records consist of ASCII characters used to represent hexadecimal values and

are summarized below.

Table 37. Intel Hex Type Frame

•

Record Mark:

–

Record Mark is the start of frame. This field must contain ’:’.

•

Reclen:

–

Reclen specifies the number of Bytes of information or data which follows

the Record Type field of the record.

•

Load Offset:

–

Load Offset specifies the 16-bit starting load offset of the data Bytes,

therefore this field is used only for

–

Data Program Record (see Section “ISP Commands Summary”).

•

Record Type:

–

Record Type specifies the command type. This field is used to interpret the

remaining information within the frame. The encoding for all the current

record types is described in Section “ISP Commands Summary”.

•

Data/Info:

–

Data/Info is a variable length field. It consists of zero or more Bytes encoded

as pairs of hexadecimal digits. The meaning of data depends on the Record

Type.

•

Checksum:

–

The two’s complement of the 8-bit Bytes that result from converting each pair

of ASCII hexadecimal digits to one Byte of binary, and including the Reclen

field to and including the last Byte of the Data/Info field. Therefore, the sum

of all the ASCII pairs in a record after converting to binary, from the Reclen

field to and including the Checksum field, is zero.

Record Mark ‘:’

Reclen

Load Offset

Record Type

Data or Info

Checksum

1 byte

2 bytes

1 bytes

n byte

1 byte

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