MCP2515
FIGURE 12-2:
READ INSTRUCTION
CS
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
SCK
instruction
address byte
0
0
0
0
0
0
1
1
A7
6
5
4
3
2
1
A0
don’t care
data out
SI
high-impedance
7
6
5
4
3
2
1
0
SO
FIGURE 12-3:
READ RX BUFFER INSTRUCTION
CS
n m Address Points to Address
0 0 Receive Buffer 0,
0x61
0x66
0x71
0x76
0
1
2
3
4
5
n
6
7
8
9
10 11 12 13 14 15
Start at RXB0SIDH
SCK
0 1 Receive Buffer 0,
instruction
Start at RXB0D0
m
1
0
0
1
0
1 0 Receive Buffer 1,
don’t care
data out
SI
0
Start at RXB1SIDH
1 1 Receive Buffer 1,
high-impedance
Start at RXB1D0
7
6
5
4
3
2
1
0
SO
FIGURE 12-4:
BYTE WRITE INSTRUCTION
CS
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
SCK
address byte
data byte
instruction
7
6
5
4
3
2
1
0
0
0
0
0
0
0
1
0
A7
6
5
4
3
2
1
A0
SI
high-impedance
SO
© 2005 Microchip Technology Inc.
Preliminary
DS21801D-page 65
MICROCHIP [ MICROCHIP ]
