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AT89C1051 Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT89C1051 Datasheet(HTML) 7 Page - ATMEL Corporation |
7 / 12 page AT89C1051 4-9 Chip Erase: The entire PEROM array (1K byte) and the two Lock Bits are erased electrically by using the proper combination of control signals and by holding P3.2 low for 10 ms. The code array is written with all “1”s in the Chip Erase operation and must be executed before any non- blank memory byte can be re-programmed. Reading the Signature Bytes: The signature bytes are read by the same procedure as a normal verification of locations 000H, 001H, and 002H, except that P3.5 and P3.7 must be pulled to a logic low. The values returned are as follows. (000H) = 1EH indicates manufactured by Atmel (001H) = 11H indicates 89C1051 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. Figure 3. Programming the Flash Memory Figure 4. Verifying the Flash Memory P3.1 P3.3 P3.5 P3.2 RDY/BSY PROG SEE FLASH PROGRAMMING MODES TABLE TO INCREMENT ADDRESS COUNTER P1 5V P3.4 PGM DATA V/ V I H PP P3.7 RST XTAL1 GND V CC AT89C1051 P3.3 P3.5 P3.2 P1 5V P3.4 PGM DATA V I H V I H P3.7 RST XTAL1 GND V CC AT89C1051 SEE FLASH PROGRAMMING MODES TABLE |
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