Datasheet

109
4235K–8051–05/08
AT89C51RD2/ED2
24.9.7 Display Data Description
Figure 24-11. Display Flow
24.9.7.1 Example
24.9.8 Read Function Description
This flow is similar for the following frames:
Host
Bootloader
Display Command
’X’ & CR & LF
RD_WR_SECURITY
Wait Display Command
Read Data
Send Security Error
Send Display Data
Send Display Command
Wait Checksum Error
Wait Display Data
Wait Security Error
OR
COMMAND ABORTED
COMMAND FINISHED
Send Checksum Error
COMMAND ABORTED
’L’ & CR & LF
OR
"Address = "
All Data Read
Complet Frame
"Reading Value"
CR & LF
All Data ReadAll Data Read
COMMAND FINISHED
Checksum error
HOST : 05 0000 04 0000 0020 00 D7
BOOTLOADER : 05 0000 04 0000 0020 00 D7
BOOTLOADER 0000=-----data------ CR LF (16 data)
BOOTLOADER 0010=-----data------ CR LF (16 data)
BOOTLOADER 0020=data CR LF ( 1 data)
Display data from address 0000h to 0020h