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AT89LP2052 датащи(PDF) 65 Page - ATMEL Corporation

номер детали AT89LP2052
подробное описание детали  8-bit Microcontroller with 2/4-Kbyte Flash
PDF  90 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LP2052 датащи(HTML) 65 Page - ATMEL Corporation

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65
3547F–MICRO–6/06
AT89LP2052/LP4052
22.4.10
Read Atmel Signature Page
Function:
• Read 1 to 32 bytes of data from the Atmel Signature Row.
• The byte address (offset in page) is initialized to bits [4:0] of the low address byte. The
internal address is incremented by one on the negative edge of the XTAL1 pulse. The
address will wrap around to the 1st byte of the page when incremented past 31.
• Read data will be output on P1 after the falling edge of fourth XTAL1 pulse (address low byte
strobe). The programmer should tri-state P1 prior to this edge to avoid bus contention on P1.
Usage:
1.
Bring CS (P3.2) low.
2.
Drive P1 to AAh and pulse XTAL1 high.
3.
Drive P1 to 38h and pulse XTAL1 high.
4.
Drive P1 to 00h and pulse XTAL1 high.
5.
Drive P1 with bits [4:0] of address and bring XTAL1 high.
6.
Tri-state P1.
7.
Bring XTAL1 low.
8.
Read data from P1.
9.
To read additional data bytes in the page, pulse XTAL1 high to increment to the next
address.
10. Drive CS high.
Figure 22-14. Read Atmel Signature Page Sequence
Note:
The waveform on this page is not to scale.
AAh
38h
00h
000bbbbb
DOUT 0
CS
XTAL1
P1
DOUT 1
DOUTn



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