POWERSTEP01 datasheet(75/92 Pages) STMICROELECTRONICS

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powerSTEP01

Programming manual

11.2.2

Nop

Nothing is performed.

11.2.3

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 51.

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 12); any attempt to write one of those registers

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

command byte, as if an unknown command code were sent (see Section 11.1.28 on page

71).

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 CMD_ERROR flag to rise at the end of the last argument byte (see

Section 11.1.28).

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

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

command code were sent.

11.2.4

GetParam (PARAM)

Table 61. Nop command structure

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00000

From host

Table 62. 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 63. GetParam command structure

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