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ATmega128 데이터시트(PDF) 265 Page - ATMEL Corporation

부품명 ATmega128
상세설명  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
PDF  386 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega128 데이터시트(HTML) 265 Page - ATMEL Corporation

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265
2467S–AVR–07/09
ATmega128
The recommended values from Table 104 are used unless other values are given in the algo-
rithm in Table 105. Only the DAC and Port Pin values of the Scan Chain are shown. The column
“Actions” describes what JTAG instruction to be used before filling the Boundary-scan Register
with the succeeding columns. The verification should be done on the data scanned out when
scanning in the data on the same row in the table.
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
Table 105. Algorithm for Using the ADC
Step
Actions
ADCEN
DAC
MUXEN
HOLD
PRECH
PA3.
Data
PA3.
Control
PA3.
Pullup_
Enable
1
SAMPLE_
PRELOAD
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



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