AT89LP2052 datasheet(66/90 Pages) ATMEL

66 / 90 page

3547F–MICRO–6/06

AT89LP2052/LP4052

22.4.11

Write Lock Bits

Function:

• Program (lock) Lock Bits 1 and 2.

Usage:

Bring CS (P3.2) low.

Drive P1 to AAh and pulse XTAL1 high.

Drive P1 to E4h and pulse XTAL1 high.

Drive P1 to 00h and pulse XTAL1 high.

Drive data on P1 and pulse XTAL1 high.

Drive CS high.

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

Figure 22-15. Write Lock Bits Sequence

22.4.12

Read Lock Bits

Function:

• Read status of Lock Bits 1 and 2.

Usage:

Bring CS (P3.2) low.

Drive P1 to 0xAA and pulse XTAL1 high.

Drive P1 to 0x64 and pulse XTAL1 high.

Drive P1 to 0x00 and pulse XTAL1 high.

Drive P1 to 0x00 and bring XTAL1 high.

Tri-state P1.

Bring XTAL1 low.

Read data from P1.

Drive CS high.

Figure 22-16. Read Lock Bits Sequence

Note:

The waveforms on this page are not to scale.

AAh

E4h

00h

111111LL

XTAL1

RDY/BSY

AAh

64h

00h

111111LL

XTAL1

AT89LP2052 Datasheet(PDF) 66 Page - ATMEL Corporation

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