L6470PD datasheet(57/70 Pages) STMICROELECTRONICS

57 / 70 page

L6470

Programming manual

Doc ID16737 Rev 5

57/70

Figure 22.

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 Section 9.1.22).

9.2.2

Nop

Nothing is performed.

9.2.3

SetParam (PARAM, VALUE)

The SetParam command sets the PARAM register value equal to VALUE; PARAM is the

respective register address listed in Table 12.

The command should be followed by the new register VALUE (most significant byte first).

The number of bytes making up the VALUE argument depends on the length of the target

Some registers cannot be written (see Table 12); any attempt to write one of those registers

causes the command to be ignored and the WRONG_CMD flag to rise at the end of the

command byte as if an unknown command code were sent (see Section 9.1.22).

Some registers can only be written in particular conditions (see Table 12); any attempt to

write one of those registers when the conditions are not satisfied causes the command to be

ignored and the NOTPERF_CMD flag to rise at the end of the last argument byte (see

Section 9.1.22).

Any attempt to set an inexistent register (wrong address value) causes the command to be

ignored and the WRONG_CMD flag to rise at the end of the command byte as if an

unknown command code were sent.

Table 38.

Nop command structure

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

000000

from host

Table 39.

SetParam command structure

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PARAM

from host

VALUE Byte 2 (if needed)

VALUE Byte 1 (if needed)

VALUE Byte 0

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