參數資料
型號: AT89C51ED2-SMRUM
廠商: Atmel
文件頁數: 5/137頁
文件大?。?/td> 0K
描述: IC MCU FLASH 8051 64K 5V 68PLCC
產品培訓模塊: MCU Product Line Introduction
標準包裝: 1
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數: 50
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 68-PLCC
包裝: 標準包裝
其它名稱: AT89C51ED2-SMRUMDKR
102
4235K–8051–05/08
AT89C51RD2/ED2
24.7
ISP Protocol Description
24.7.1
Physical Layer
The UART used to transmit information has the following configuration:
Character: 8-bit data
Parity: none
Stop: 2 bits
Flow control: none
Baudrate: autobaud is performed by the bootloader to compute the baudrate chosen by the
host.
24.7.2
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.
Figure 24-6. 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 informa-
tion within the frame. The encoding for all the current record types is described in Section “ISP
Data/Info:
Data/Info is a variable length field. It consists of zero or more bytes encoded as pairs of hexa-
decimal 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 hexadec-
imal 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
Load
Data
Mark
’:’
Reclen
Offset
Type
or
Info
Checksum
1-byte
2-bytes
1-byte
n-bytes
1-byte
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