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ATmega169P датащи(PDF) 271 Page - ATMEL Corporation

номер детали ATmega169P
подробное описание детали  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  393 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega169P датащи(HTML) 271 Page - ATMEL Corporation

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271
8018N–AVR–08/09
ATmega169P
Using this algorithm, the timing constraint on the HOLD signal constrains the TCK clock fre-
quency. As the algorithm keeps HOLD high for five steps, the TCK clock frequency has to be at
least five times the number of scan bits divided by the maximum hold time, t
hold,max
25.6
Boundary-scan Order
Table 25-5 shows the Scan order between TDI and TDO when the Boundary-scan chain is
selected as data path. Bit 0 is the LSB; the first bit scanned in, and the first bit scanned out. The
scan order follows the pin-out order as far as possible. Therefore, the bits of Port A is scanned in
the opposite bit order of the other ports. Exceptions from the rules are the Scan chains for the
analog circuits, which constitute the most significant bits of the scan chain regardless of which
physical pin they are connected to. In Figure 25-3, PXn. Data corresponds to FF0, PXn. Control
corresponds to FF1, and PXn. Pull-up_enable corresponds to FF2. Bit 4, 5, 6, and 7of Port F is
not in the scan chain, since these pins constitute the TAP pins when the JTAG is enabled.
Table 25-4.
Algorithm for Using the ADC
Step
Actions
ADCEN
DAC
MUXEN
HOLD
PRECH
PA3.
Data
PA3.
Control
PA3.
Pull-up_
Enable
1
SAMPLE_P
RELOAD
1
0x200
0x08
1
1
0
0
0
2
EXTEST
1
0x200
0x08
0
1
0
0
0
3
1
0x200
0x08
1
1
0
0
0
4
1
0x123
0x08
1
1
0
0
0
5
1
0x123
0x08
1
0
0
0
0
6
Verify the
COMP bit
scanned out
to be 0
1
0x200
0x08
1
1
0
0
0
7
1
0x200
0x08
0
1
0
0
0
8
1
0x200
0x08
1
1
0
0
0
9
1
0x143
0x08
1
1
0
0
0
10
1
0x143
0x08
1
0
0
0
0
11
Verify the
COMP bit
scanned out
to be 1
1
0x200
0x08
1
1
0
0
0
Table 25-5.
ATmega169P Boundary-scan Order
Bit Number
Signal Name
Module
197
AC_IDLE
Comparator
196
ACO
195
ACME
194
AINBG



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