T89C51RD2-3CWC-L datasheet(68/86 Pages) ATMEL

68 / 86 page

Rev. F - 15 February, 2001

T89C51RD2

• Step 8: Input the valid address on the address lines.

• Step 9: Pulse ALE/PROG once until P3.2 is high or the specified write time is reached.

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 23.)

• Step 10: Disable programming access (PELCK mode)

8.9.5. Verify algorithm

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:

• 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.

Repeat step 2 through 3 changing the address for the entire array verification (See Figure 23.).

Figure 23. Programming and Verification Signal’s Waveform

8.9.6. Extra memory mapping

The memory mapping the T89C51RD2 software registers in the Extra FLASH memory is described in the table below.

Table 34. Extra Row Memory Mapping (XAF)

Address

Default content

Copy of device ID #3

0061h

FFh

Control signals

Data In

ALE/PROG

A0-A15

Programming Cycle

D0-D7

Data Out

Read/Verify Cycle

P2.7

48 clk (load latch ) or 10 ms (write)

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