AT89C51AC2 Atmel Corporation, AT89C51AC2 Datasheet - Page 24

• 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

Erase Flash
Start Bootloader
24
A/T89C51AC2 UART Bootloader
The A/T89C51AC2 flash memory is divided in several blocks:
Block 0: from address 0000h to 1FFFh
Block 1: from address 2000h to 3FFFh
Block 2: from address 4000h to 7FFFh
These three blocks contain 128 pages.
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•
Note:
This routine allows to start at the beginning of the bootloader as after a reset. After calling this
routine the regular boot process is performed and the communication must be opened before
any action.
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Parameter Settings
Instruction: LCALL FFF0h.
No special parameter setting
Set bit ENBOOT in AUXR1 register
instruction: LJUMP or LCALL at address F800h
1. See the A/T89C51AC2 datasheet for the time that a write operation takes and this time must
2. No special resources are used by the bootloader during these operations
__api_erase_block0
__api_erase_block1
__api_erase_block2
be multiplied by the number of pages.
API Name
R1
01h
DPTR0
0000h
2000h
4000h
DPTR1
x
x
x
4231D–CAN–03/08
Acc
x
x
x