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ATmega325P 데이터시트(PDF) 283 Page - ATMEL Corporation

부품명 ATmega325P
상세설명  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P 데이터시트(HTML) 283 Page - ATMEL Corporation

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283
8023F–AVR–07/09
ATmega325P/3250P
Figure 25-6. Mapping Between BS1, BS2 and the Fuse and Lock Bits During Read
25.6.13
Reading the Signature Bytes
The algorithm for reading the Signature bytes is as follows (refer to ”Programming the Flash” on
page 277 for details on Command and Address loading):
1.
A: Load Command “0000 1000”.
2.
B: Load Address Low Byte (0x00 - 0x02).
3.
Set OE to “0”, and BS1 to “0”. The selected Signature byte can now be read at DATA.
4.
Set OE to “1”.
25.6.14
Reading the Calibration Byte
The algorithm for reading the Calibration byte is as follows (refer to ”Programming the Flash” on
page 277 for details on Command and Address loading):
1.
A: Load Command “0000 1000”.
2.
B: Load Address Low Byte, 0x00.
3.
Set OE to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA.
4.
Set OE to “1”.
25.6.15
Parallel Programming Characteristics
Figure 25-7. Parallel Programming Timing, Including some General Timing Requirements
Lock Bits
0
1
BS2
Fuse High Byte
0
1
BS1
DATA
Fuse Low Byte
0
1
BS2
Extended Fuse Byte
Data & Contol
(DATA, XA0/1, BS1, BS2)
XTAL1
t
XHXL
t
WLWH
t
DVXH
t
XLDX
t
PLWL
t
WLRH
WR
RDY/BSY
PAGEL
t
PHPL
t
PLBX
t
BVPH
t
XLWL
t
WLBX
t
BVWL
WLRL



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