AT89C51AC3-SLSIM Atmel, AT89C51AC3-SLSIM Datasheet - Page 49

• Manufacturer Part Number: AT89C51AC3-SLSIM
• Description: IC 8051 MCU FLASH 64K 44PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51AC3-SLSIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Hardware Security Byte
4383D–8051–02/08
Figure 26. Flash and Extra Row Programming Procedure
The following procedure is used to program the Hardware
and is summarized in Figure 27:
•
•
•
•
•
•
•
Set FPS and map Hardware byte (FCON = 0x0C)
Save and disable the interrupts.
Load DPTR at address 0000h.
Load Accumulator register with the data to load.
Execute the MOVX @DPTR, A instruction.
Launch the programming by writing the data sequence 54h followed by A4h in
FCON register (only from FM1).
The end of the programming indicated by the FBusy flag cleared.
Restore the interrupts.
Column Latches Loading
Launch Programming
Save and Disable IT
End Programming
Programming
Flash Spaces
see Figure 25
FCON = Axh
FCON = 5xh
FCON = 00h
Clear Mode
Cleared?
Restore IT
FBusy
EA = 0
Security
Byte space
49