AT89LP4052-20PI datasheet(59/90 Pages) ATMEL

59 / 90 page

3547F–MICRO–6/06

AT89LP2052/LP4052

22.4.3

Program Enable

Function:

• Enables the programming interface to receive commands.

• Program Enable must be the first command issued in any programming session. In parallel

programming a session is active while RST remains at V

PP. In serial programming a session

is active while RST remains at V

CC.

Usage:

Bring CS (P3.2) low.

Drive P1 to AAh and pulse XTAL1 high.

Drive P1 to ACh and pulse XTAL1 high.

Drive P1 to 53h and pulse XTAL1 high.

Bring CS high.

Figure 22-7. Program Enable Sequence

22.4.4

Chip Erase

Function:

• Erases (programs FFh to) the entire 2/4-Kbyte memory array.

• Erases User Signature Row if User Row Programming Fuse bit is enabled.

• Lockbit1 and Lockbit2 are programmed to “unlock” state.

Usage:

Bring CS (P3.2) low.

Drive P1 to AAh and pulse XTAL1 high.

Drive P1 to 8Ah and pulse XTAL1 high.

Bring CS high.

Wait 4 ms, monitor P3.1, or poll data/status.

Figure 22-8. Chip Erase Sequence

Note:

The waveforms on this page are not to scale.

AAh

ACh

53h

XTAL1

AAh

8Ah

XTAL1

RDY/BSY

AT89LP4052-20PI 数据表(PDF) 59 Page - ATMEL Corporation

AT89LP4052-20PI 数据表(HTML) 59 Page - ATMEL Corporation

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