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AS3955 데이터시트(PDF) 63 Page - ams AG

부품명 AS3955
상세설명  NFC Forum Compliant Dynamic Tag
PDF  102 Pages
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제조업체  AMSCO [ams AG]
홈페이지  http://www.ams.com
Logo AMSCO - ams AG

AS3955 데이터시트(HTML) 63 Page - ams AG

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ams Datasheet
Page 63
[v1-04] 2016-Feb-03
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AS3955 − Detailed Description
Figure 64:
Reading an EEPROM Block over SPI
Loading Transmission Data into Buffer
Loading the transmitting data into the buffer is similar to
writing data into an addressable registers. Difference is that in
case of loading more bytes all bytes go to the buffer. The
command mode code 100b indicates buffer write operation. A
bit stream of 32 bytes of data can be transferred. The following
figure shows how to load the transmission data into the buffer.
Figure 65:
Loading Data into Buffer over SPI
01 1 1 1 1 1 1
W
A
4
W
A
3
W
A
2
W
A
1
W
A
0
x
W
A
6
W
A
5
X
MSB Byte from Address
<WA6-WA0>
/SS
SCLK
MOSI
X
B
2
9
B
2
8
B
2
7
B
2
6
B
2
5
B
2
4
B
3
1
B
3
0
B
2
3
B
2
2
B
5
B
4
B
3
B
2
B
1
B
0
B
7
B
6
B
9
B
8
XX
LSB Byte from Address
<WA6-WA0>
X
MISO
1µs min
/SS
SCLK
MOSI
10
0
x
x
x
x
x
1 to 32
bytes
X
SCLK rising
edge Data is
transfered
from µC
SCLK falling
edge Data is
sampled
/SS rising edge
signals end of
COMMAND Mode
10 pattern
indicates
FIFO mode
X
Start of
payload Data



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