AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 109

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

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