
130
AT89C51ID2
4289C–8051–11/05
Command Data Stream
Protocol
All commands are sent using the same flow. Each frame sent by the host is echoed by
the bootloader.
Figure 52. Command Flow
4800
OKOKOKOKOK
OKOKOKOK
9600
OKOKOKOKOK
OKOKOKOK
19200
OK
38400
-
OK
57600
-
OK
-
OK
OKOKOKOK
115200
--
OK
-
OK
-
---
Table 95. Autobaud Performances (Continued)
Frequency (MHz)
Baudrate (kHz)
1.8432
2
2.4576
3
3.6864
4
5
6
7.3728
Bootloader
":"
Sends first character of the
Frame
If (not received ":")
Sends frame (made of 2 ASCII
Gets frame, and sends back ec
for each received byte
Host
Else
":"
Sends echo and start
reception
characters per byte)
Echo analysis