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

device address register on the next and all subsequent

power-ups. If the device is not blank, this command will return

the programmed value during the next message time.

Programming the NVM address to $0 is allowed. This

ensures that the device always acts as a dynamically

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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