t89c51rd2-slscl ATMEL Corporation, t89c51rd2-slscl Datasheet - Page 78

• Manufacturer Part Number: t89c51rd2-slscl
• Description: 0 To 40 Mhz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL Corporation

Programming Algorithm
Verify Algorithm
78
T89C51RD2
To program the T89C51RD2 the following sequence must be exercised:
•
•
If the security bits are activated, the following commands must be done before
programming:
•
•
•
•
•
•
To write a page in the Flash memory, execute the following steps:
•
•
•
•
•
•
Repeat step 2 through 5 changing the address and data for end of a 128 bytes page
•
•
•
•
Repeat step 0 through 9 changing the address and data until the entire array or until the
end of the object file is reached (See Figure 32.)
•
Verify must be done after each byte or block of bytes is programmed. In either case, a
complete verify of the programmed array will ensure reliable programming of the
T89C51RD2.
P 2.7 is used to enable data output.
To verify the T89C51RD2 code the following sequence must be exercised:
•
•
•
Repeat step 2 through 3 changing the address for the entire array verification
(See Figure 32.).
Check the signature bytes
Check the HSB (VSB mode)
Unlock test modes (PEULCK mode, pulse 55h and AAh)
Chip erase (CERR mode)
Write FFh in the HSB (PGMS mode)
Write the signature bytes content in the XAF
As the boot loader and the XAF content is lost after a "chip erase", it must be
reprogrammed if needed.
Disable programming access (PELCK mode)
Step 0: Enable programming access (PEULCK mode)
Step 1: Activate the combination of control signals (PGML mode)
Step 2: Input the valid address on the address lines (High order bits of the address
must be stable during the complete ALE low time)
Step 3: Activate the combination of control signals (PGML mode)
Step 4: Input the appropriate data on the data lines.
Step 5: Pulse ALE/PROG once.
Step 6: Enable programming access (PEULCK mode)
Step 7: Activate the combination of control signals (PGMC mode)
Step 8: Input the valid address on the address lines.
Step 9: Pulse ALE/PROG once the specified write time is reached.
Step 10: Disable programming access (PELCK mode)
Step 1:Activate the combination of program and control signals (PGMV)
Step 2: Input the valid address on the address lines.
Step 3: Read data on the data lines.
4243G–8051–05/03