STMicroelectronics Stepper motor driver mounting the L6474 in high power PowerSO package EVAL6474PD EVAL6474PD Hoja De Datos
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EVAL6474PD
Programming manual
L6474
44/52
Doc ID 022529 Rev 3
Figure 15.
Command with three-byte argument
By default, the device returns an all zeroes response for any received byte, the only
exceptions are GetParam and GetStatus commands. When one of these commands is
received, the following response bytes represent the related register value (see
exceptions are GetParam and GetStatus commands. When one of these commands is
received, the following response bytes represent the related register value (see
).
Response length can vary from 1 to 3 bytes.
Figure 16.
Command with three-byte response
During response transmission, new commands can be sent. If a command requiring a
response is sent before the previous response is completed, the response transmission is
aborted and the new response is loaded into the output communication buffer (see
response is sent before the previous response is completed, the response transmission is
aborted and the new response is loaded into the output communication buffer (see
Figure 17.
Command response aborted
When a byte that does not correspond to a command is sent to the IC it is ignored and the
WRONG_CMD flag in the STATUS register is raised (see
WRONG_CMD flag in the STATUS register is raised (see
).
9.2.2 Nop
Nothing is performed.
Table 31.
Nop command structure
Bit
7 Bit
6 Bit
5 Bit
4 Bit
3 Bit
2 Bit
1 Bit
0
0 0 0 0 0 0 0 0 From
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