AT89C51AC3 Atmel Corporation, AT89C51AC3 Datasheet - Page 13

• 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

Example
Program
Configuration
Information
Requests from Host
Answers from
Bootloader
4386B–8051–03/08
The flow described below allows the user to program Configuration Information regarding the
bootloader functionality.
The Boot Process Configuration:
Note:
The bootloader answers with:
•
•
•
Program SSB level1
Program SSB level2
Command Name
Erase SBV & BSB
Program bit BLJB
Program bit X2
BSB
SBV
Fuse bits (BLJB and X2 bits) (see Section “Mapping and Default Value of Hardware Security
Byte”)
SSB
EB
‘.’ & ‘CR’ & ’LF’ when the value is programmed
‘X’ & ‘CR’ & ‘LF’ if the checksum is wrong
‘P’ & ‘CR’ & ‘LF’ if the Security is set
Program BSB
Program SBV
Program EB
1. The field “Load Offset” is not used
2. To program the BLJB and X2 bit the “bit value” is 00h or 01h.
Display data from address 0000h to 0020h
BOOTLOADER
BOOTLOADER
BOOTLOADER
HOST
BOOTLOADER
Record
Type
03h
0000=-----data------ CR LF
0010=-----data------ CR LF
0020=data CR LF
: 05 0000 04 0000 0020 00 D7
: 05 0000 04 0000 0020 00 D7
Offset
Load
x
AT89C51AC3 UART Bootloader
Record
Length
02h
02h
03h
03h
Data[0]
0Ah
04h
05h
06h
Data[1]
(16 data)
(16 data)
( 1 data)
00h
00h
01h
00h
01h
06h
04h
08h
Data[2]
bit value
value
-
-
-
13