TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
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Command 6 - ADDRESS EXTENSION
The address extension command is mainly used for the 3-byte addressing mode as shown in Figure 10.
For SPI masters that can only process datagrams with an even number of bytes, it might be necessary to
pad the datagram to an even number of bytes. This can be achieved by duplicating the third byte of the
3-byte address/command part and using the address extension command in all but the last duplicate.
For example, a SPI master that is only capable of transmitting a multiple of 4 bytes cannot use the example
datagram for a write access above since it contains 5 bytes. With three added padding bytes, the master
has to transmit two 4-byte groups.
Example datagram (Write starting at address 0x4200): 0x10 0x06 0x58 0x58 0x58 0x50 0x4C 0x48
Example reply (0xXX is undefined data):
0x00 0x00 0x00 0xXX 0xXX 0xXX 0xXX 0xXX
5.1.2 Timing example
This example shows a generic read access with wait state and 2 byte addressing. All configurable options
are shown. The delays between the transferred bytes are just to show the byte boundaries and are not
required.
CSN active low
CSN active high
SCK mode 0
SCK mode 1
SCK mode 2
SCK mode 3
A
A
A
A
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0
MOSI
12 11 10
MISO mode 0/2
normal sample
I
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15 14 13 12 11 10
15 14 13 12 11 10
MISO mode 0/2
late sample
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15 14 13 12 11 10
15 14 13 12 11 10
MISO mode 1/3
normal sample
I
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15 14 13 12 11 10
15 14 13 12 11 10
MISO mode 1/3
late sample
I
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1
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0
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S
15 14 13 12 11 10
15 14 13 12 11 10
Figure 11: SPI timing example
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