33793 datasheet(19/27 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33793

FUNCTIONAL DEVICE OPERATION

DSI COMMANDS AND RESPONSES

addressable device and would be immune to any inadvertent

future NVM programming sequences.

Reads and writes are long-word commands only. The

command format is found in Table 21.

READ/WRITE NVM RESPONSE

This response message is sent during the next message

following a valid Read/Write NVM command to the addressed

device. The response format is found in Table 22. The high

byte is omitted during the short-word response. No response

is generated if the command address field was $0.

CLEAR LOGIC OUT COMMAND

The Clear Logic Out command sets the Logic Out pin to a

logic low. The compliment to this command is the Set Logic

Out. The Logic Out is also cleared at power-up or following a

Clear command. The format of the Clear Logic Out command

is shown in Table 23.

CLEAR LOGIC OUT RESPONSE

This response message is sent during the next message

following a valid Clear Logic Out command to the addressed

device. The response is shown in Table 24. No response is

generated if the command address field was $0.

Table 21. Read/Write NVM Command Format

Data

Address

Command

CRC

PA3

PA2

PA1

PA0

Legend

A[3:0] = Address bits. These bits are the address of the device

previously sent with the Initialization command. They must match

the address in the PA[3:0] field and the address stored in the

device address register.

PA[3:0] = Program Address bits. These bits are the address that is to be

programmed into the slave.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

master.

Table 22. Read/Write NVM Response Format

High Byte

Low Byte

CRC

PA3

PA2

PA1

PA0

Legend

A[3:0] = Address bits. The slave address.

PA[3:0] = Programmed Address bits. The address that was

programmed into the NVM address bits of the slave.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

slave.

Table 23. Clear Logic Out Command Format

Data

Address

Command

CRC

–

–-

Legend

A[3:0] = Address bits. The address of the selected device.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

master.

Table 24. Clear Logic Out Response Format

High Byte

Low Byte

CRC

IO3

IO2

IO1

IO0

Legend

A[3:0] = Address bits. The slave address.

BS = Bus Switch Position (1=closed).

LO = Logic out driven level.

IO[3:0] = Values at logic I/Os.

NV = Nonvolatile Memory Write. The value of the NV bit in the slave.

U = Undervoltage indicated true by a “1”.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

slave.

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