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AT89C51-12PI Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT89C51-12PI Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 15 page AT89C51 4-34 Program Verify: If lock bits LB1 and LB2 have not been programmed, the programmed code data can be read back via the address and data lines for verification. The lock bits cannot be verified directly. Verification of the lock bits is achieved by observing that their features are enabled. Chip Erase: The entire Flash array is erased electrically by using the proper combination of control signals and by holding ALE/PROG low for 10 ms. The code array is written with all “1”s. The chip erase operation must be executed before the code memory can be re-programmed. Reading the Signature Bytes: The signature bytes are read by the same procedure as a normal verification of locations 030H, 031H, and 032H, except that P3.6 and P3.7 must be pulled to a logic low. The values returned are as follows. (030H) = 1EH indicates manufactured by Atmel (031H) = 51H indicates 89C51 (032H) = FFH indicates 12V programming (032H) = 05H indicates 5V programming Programming Interface Every code byte in the Flash array can be written and the entire array can be erased by using the appropriate combi- nation of control signals. The write operation cycle is self- timed and once initiated, will automatically time itself to completion. All major programming vendors offer worldwide support for the Atmel microcontroller series. Please contact your local programming vendor for the appropriate software revision. Flash Programming Modes Note: 1. Chip Erase requires a 10-ms PROG pulse. Mode RST PSEN ALE/PROG EA/VPP P2.6 P2.7 P3.6 P3.7 Write Code Data H L H/12V L H H H Read Code Data H L H H L L H H Write Lock Bit - 1 H L H/12V H H H H Bit - 2 H L H/12V H H L L Bit - 3 H L H/12V H L H L Chip Erase H L H/12V H L L L Read Signature Byte H L H H L L L L (1) |
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