AT89C51AC2 Atmel Corporation, AT89C51AC2 Datasheet - Page 10

• Manufacturer Part Number: AT89C51AC2
• Manufacturer: Atmel Corporation

Specifications of AT89C51AC2

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 40 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 1.25
• 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 5. Command Flow
10
Sends frame (made of 2 ASCII
characters per Byte)
Echo analysis
A/T89C51AC2 UART Bootloader
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
’:’
’:’
-
-
-
11.059
OK
OK
OK
2
12
OK
-
-
14.746
Gets frame, and sends back echo
for each received Byte
OK
OK
OK
Else
If (not received ’:’)
Sends echo and start
reception
Bootloader
16
OK
OK
-
20
OK
OK
-
24
OK
OK
-
4231D–CAN–03/08
26.6
OK
OK
-