33903 datasheet(63/104 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33903/4/5

SERIAL PERIPHERAL INTERFACE

DETAIL OPERATION

BITS 15, 14 AND 8 FUNCTIONS

Table 10 summarizes the various SPI operation, depending upon bit 15, 14, and 8.

Table 10. SPI Operations (bits 8, 14 & 15)

Control Bits MOSI[15-14], C1-C0

Type of Command

Parity/Next

MOSI[8] P/N

Note for Bit 8 P/N

Read back of register

content and block (CAN,

I/O, INT, LINs) real time

state. See Table 37.

Bit 8 must be set to 1, independently of the parity function

selected or not selected.

Write to register

address, to control the

device operation

If bit 8 is set to “0”: means parity not selected OR

parity is selected AND parity = 0

if bit 8 is set to “1”: means parity is selected AND parity = 1

Reserved

Read of device flags

form a register address

Bit 8 must be set to 1, independently of the parity function

selected or not selected.

BITS 13-9 FUNCTIONS

The device contains several registers coded on five bits

(bits 13 to 9).

Each register controls or reports part of the device’s

function. Data can be written to the register to control the

device operation or to set the default value or behavior.

Every register can also be read back in order to ensure

that it’s content (default setting or value previously written) is

correct.

In addition, some of the registers are used to report device

flags.

Device Status on MISO

When a write operation is performed to store data or

control bits into the device, the MISO pin reports a 16 bit fixed

device status composed of 2 bytes: Device Fixed Status (bits

15 to 8) + extended Device Status (bits 7 to 0). In a read

operation, MISO will report the Fixed device status (bits 15 to

8) and the next eight bits will be the content of the selected

Table 11 is a list of device registers and addresses, coded

with bits 13 to 9.

Table 11. Device Registers with Corresponding Address

Address

MOSI[13-9]

A4...A0

Description

Quick Ref.

Name

Functionality

0_0000

Analog Multiplexer

MUX

1) Write “device control bits” to register address.

2) Read back register “control bits”

0_0001

Memory byte A

RAM_A

1) Write “data byte” to register address.

2) Read back “data byte” from register address

0_0010

Memory byte B

RAM_B

0_0011

Memory byte C

RAM_C

0_0100

Memory byte D

RAM_D

0_0101

Initialization Regulators

Init REG

1) Write “device initialization control bits” to register address.

2) Read back “initialization control bits” from register address

0_0110

Initialization Watchdog

Init watchdog

0_0111

Initialization LIN and I/O

Init LIN I/O

0_1000

Initialization Miscellaneous functions

Init MISC

0_1001

Specific modes

SPE_MODE

1) Write to register to select device Specific mode, using “Inverted

Random Code”.

2) Read “Random Code”

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