89C1051U Ver la hoja de datos (PDF) - Atmel Corporation

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89C1051U

8-Bit Microcontroller with 1K Bytes Flash

Atmel Corporation 

AT89C1051U

Flash Programming Modes

Mode

Write Code Data(1)(3)

RST/VPP

12V

Read Code Data(1)

Write Lock

H

Bit - 1

12V

P3.2/PROG

H

P3.3

L

P3.4

H

P3.5

H

P3.7

H

L

L

H

H

H

H

H

H

Bit - 2

12V

H

H

L

L

Chip Erase

12V

(2)

H

L

L

L

Read Signature Byte

H

H

L

L

L

L

Notes: 1. The internal PEROM address counter is reset to 000H on the rising edge of RST and is advanced by a positive pulse at

XTAL1 pin.

2. Chip Erase requires a 10-ms PROG pulse.

3. P3.1 is pulled Low during programming to indicate RDY/BSY.

Figure 3. Programming the Flash Memory

AT89C1051U

Figure 4. Verifying the Flash Memory

AT89C1051U

PP

7

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