Datasheet

Table Of Contents

DocID16737 Rev 7 59/73

L6470 Programming manual

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 on page 44.

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 on page

55).

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.

9.2.4 GetParam (PARAM)

This command reads the current PARAM register value; PARAM is the respective register

address listed in Table 12.

The command response is the current value of the register (most significant byte first). The

number of bytes making up the command response depends on the length of the target

The returned value is the register one at the moment of GetParam command decoding. If

All registers can be read anytime.

Table 39. SetParam command structure

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

000 PARAM

From host

VALUE Byte 2 (if needed)

VALUE Byte 1 (if needed)

VALUE Byte 0

Table 40. GetParam command structure

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 0 1 PARAM From host

ANS Byte 2 (if needed) To host

ANS Byte 1 (if needed) To host

ANS Byte 0 To host