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ENC28J60T-C/SS датащи(PDF) 28 Page - Microchip Technology

номер детали ENC28J60T-C/SS
подробное описание детали  Stand-Alone Ethernet Controller with SPI Interface
PDF  96 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ENC28J60T-C/SS датащи(HTML) 28 Page - Microchip Technology

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ENC28J60
DS39662B-page 26
Preliminary
© 2006 Microchip Technology Inc.
4.2
SPI Instruction Set
The operation of the ENC28J60 depends entirely on
commands given by an external host controller over the
SPI interface. These commands take the form of
instructions, of one or more bytes, which are used to
access the control memory and Ethernet buffer spaces.
At the least, instructions consist of a 3-bit opcode,
followed by a 5-bit argument that specifies either a
register address or a data constant. Write and bit field
instructions are also followed by one or more bytes of
data.
A total of seven instructions are implemented on the
ENC28J60. Table 4-1 shows the command codes for
all operations.
TABLE 4-1:
SPI INSTRUCTION SET FOR THE ENC28J60
Instruction
Name and Mnemonic
Byte 0
Byte 1 and Following
Opcode
Argument
Data
Read Control Register
(RCR)
00
0aaa
aa
N/A
Read Buffer Memory
(RBM)
00
1110
10
N/A
Write Control Register
(WCR)
01
0aaa
aa
d
d
d
d
d
d
d
d
Write Buffer Memory
(WBM)
01
1110
10
d
d
d
d
d
d
d
d
Bit Field Set
(BFS)
10
0aaa
aa
d
d
d
d
d
d
d
d
Bit Field Clear
(BFC)
10
1aaa
aa
d
d
d
d
d
d
d
d
System Reset Command (Soft Reset)
(SRC)
11
1111
11
N/A
Legend: a = control register address, d = data payload.



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