Analog Integrated Circuit Device Data

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Freescale Semiconductor

39

33814

5.3.9

SPI Command Summary

The SPI commands are defined as 16 bits with 4 address control bits and 12 command data bits. There are 7 separate commands

that are used to set the operational parameters of device. The operational parameters are stored internally in 8-bit registers. Write

commands write the data contained in the present SPI word whereas read commands have to wait until the next SPI command

is sent to read the data requested.

Table 17 defines the commands and default state of the internal registers at POR. SPI commands may be sent to the device at

any time while the device is in the Normal state.

Messages sent are acted upon on the rising edge of the CSB input.

Bit value returned equals bit value sent for this command

5.3.9.1

SPI Commands

There are seven SPI commands that can be issued by the MCU to:

• Do a SPI Check verification

• Read the contents of the SPI configuration registers

• Write the contents of the SPI configuration registers

• Read the contents of the SPI status registers

• Write the contents of the SPI status registers

• Read the contents of the SPI control registers

• Write the contents of the SPI control registers

5.3.9.2

SPI Registers

The SPI interface consists of three blocks of four, 8-bit read/write registers.

There are three types of SPI registers:

• Configuration Registers - These registers allow the MCU to configure the various parameters and options for the various

functional blocks.

• Control Registers - These registers are used to command the outputs on and off and set the PWM duty cycle values.

• Status Registers - These registers report back faults and other conditions of the various functional blocks.

The following acronyms are use in the SPI table:

• OC = over-current, could be short to battery (SB)

• OV = over-voltage

Table 20. SPI Command Messages

Command

Control Address Bits

Data Bits

hex

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

SPI Check

0

0

0

0

0

X*

X*

X*

X*

X*

X*

X*

X*

X*

X*

X*

X*

Read Configuration

Register

1

0

0

0

1

<0000>

Internal Register Address

0/1

0/1

0/1

0/1

0/1

0/1

0/1

0/1

Write Configuration

Register

2

0

0

1

0

<0000>

Internal Register Address

0/1

0/1

0/1

0/1

0/1

0/1

0/1

0/1

Read Status Register

3

0

0

1

1

<0000>

Internal Register Address

0/1

0/1

0/1

0/1

0/1

0/1

0/1

0/1

Write Status Register

4

0

1

0

0

<0000>

Internal Register Address

0/1

0/1

0/1

0/1

0/1

0/1

0/1

0/1

Read Control Register

5

0

1

0

1

<0000>

Internal Register Address

0/1

0/1

0/1

0/1

0/1

0/1

0/1

0/1

Write Control Register

6

0

1

1

0

<0000>

Internal Register Address

0/1

0/1

0/1

0/1

0/1

0/1

0/1

0/1

SPI Check Response

7

0

1

1

1

X*

X*

X*

X*

X*

X*

X*

X*

X*

X*

X*

X*