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AT89LP4052 データシート(PDF) 69 Page - ATMEL Corporation

部品番号 AT89LP4052
部品情報  8-bit Microcontroller with 2/4-Kbyte Flash
PDF  94 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LP4052 データシート(HTML) 69 Page - ATMEL Corporation

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69
3547J–MICRO–10/09
AT89LP2052/LP4052
23.4.11
Write Lock Bits
Function:
• Program (lock) Lock Bits 1 and 2.
Usage:
1.
Bring CS (P3.2) low.
2.
Drive P1 to AAh and pulse XTAL1 high.
3.
Drive P1 to E4h and pulse XTAL1 high.
4.
Drive P1 to 00h and pulse XTAL1 high.
5.
Drive P1 to 00h and pulse XTAL1 high.
6.
Drive data on P1 and pulse XTAL1 high.
7.
Drive CS high.
8.
Wait 4 ms, monitor P3.1, or poll data/status.
Figure 23-15. Write Lock Bits Sequence
23.4.12
Read Lock Bits
Function:
• Read status of Lock Bits 1 and 2.
Usage:
1.
Bring CS (P3.2) low.
2.
Drive P1 to 0xAA and pulse XTAL1 high.
3.
Drive P1 to 0x64 and pulse XTAL1 high.
4.
Drive P1 to 0x00 and pulse XTAL1 high.
5.
Drive P1 to 0x00 and bring XTAL1 high.
6.
Tri-state P1.
7.
Bring XTAL1 low.
8.
Read data from P1.
9.
Drive CS high.
Figure 23-16. Read Lock Bits Sequence
Note:
The waveforms on this page are not to scale.
AAh
E4h
00h
00h
111111LL
CS
XTAL1
P1
RDY/BSY
AAh
64h
00h
00h
111111LL
CS
XTAL1
P1



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