AT89C51AC3 Atmel Corporation, AT89C51AC3 Datasheet - Page 9

• Manufacturer Part Number: AT89C51AC3
• Manufacturer: Atmel Corporation

Specifications of AT89C51AC3

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 2.25
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

Command Data Stream Protocol
Figure 3. Command Flow
4386B–8051–03/08
Sends frame (made of 2 ASCII
characters per Byte)
Echo analysis
Sends first character of the
Frame
Host
All commands are sent using the same flow. Each frame sent by the host is echoed by the
bootloader.
Frequency
(MHz)
Baudrate
(kHz)
38400
57600
115200
8
-
-
-
10
-
-
-
":"
":"
11.0592
AT89C51AC3 UART Bootloader
OK
OK
OK
12
OK
-
-
Gets frame, and sends back echo
for each received Byte
14.746
OK
OK
OK
Else
If (not received ":")
Sends echo and start
reception
Bootloader
16
OK
OK
-
20
OK
OK
-
24
OK
OK
-
26.6
OK
OK
-
9