L6480 datasheet(62/73 Pages) STMICROELECTRONICS

62 / 73 page

Programming manual

L6480

62/73

Doc ID 023278 Rev 3

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 11.

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

The number of bytes composing the VALUE argument depends on the length of the target

Some registers cannot be written (see Table 11); 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 9.1.24).

Some registers can only be written in particular conditions (see Table 11); 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 9.1.24).

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.

9.2.4

GetParam (PARAM)

Table 49.

Nop command structure

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

000000

From host

Table 50.

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

Table 51.

GetParam command structure

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PARAM

from host

ANS Byte 2 (if needed)

to host

ANS Byte 1 (if needed)

to host

ANS Byte 0

to host

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