89C2051 参数 Datasheet PDF下载

AT89C2051

Flash Programming Modes

Mode

Write Code Data

(1)(3)

RST/VPP

12V

P3.2/PROG

P3.3

L

P3.4

H

P3.5

H

P3.7

H

Read Code Data

(1)

Write Lock

Bit - 1

H

12V

H

L

H

L

H

H

H

H

H

Bit - 2

12V

H

H

L

L

Chip Erase

12V

(2)

H

L

L

L

Read Signature Byte

Notes:

H

H

L

L

L

L

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

XTAL 1 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

Figure 4.

Verifying the Flash Memory

PP

4-21