參數(shù)資料
型號: HMS99C51S
廠商: Electronic Theatre Controls, Inc.
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH
中文描述: 8位單片機(jī)與嵌入式閃存微控制器
文件頁數(shù): 65/73頁
文件大小: 696K
代理商: HMS99C51S
HMS99C51S/52S/54S/56S/58S
Sep. 2004 Ver 1.01
61
Protocol Description
1.Overview
An initialization step must be performed after each Reset. After microcontroller reset, the bootloader waits for
an autobaud sequence. When the communication is initialized, the protocol depends on the record type request-
ed by the host.
2.Communication Initialization
The host initializes the communication by sending a “U” character to help the bootloader to compute the
baudrate (autobaud).
3.Command Data Stream Protocol
All commands are sent using the same flow.
Initialization
Bootloader
Performs autobaud and sends
back the received byte.
Host
U
Init communication
If(not received “U”)
Else
Communication opened
“U”
“U”
Command Flow
Bootloader
If(not received “:”)
Gets frame, and sends back echo
for each received byte
Host
Sends frame(made of 2 ASCII
characters per byte)
Echo analysis
“:”
“:”
Sends first character of the frame
Else
Sends echo and start
reception
.
Note: All commands sent with the echo mechanism will be represented by:
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