MCZ33784EF/R2- FREESCALE [Freescale Semiconductor, Inc], MCZ33784EF/R2- Datasheet - Page 18

• Manufacturer Part Number: MCZ33784EF/R2-
• Description: DSI 2.02 Sensor Interface
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

enhanced long commands, and enhanced short responses
will be sent for enhanced short commands of the same
length. If an enhanced long word is sent after an enhanced
short word, or an enhanced short word is sent after an
INTRODUCTION
commands that can be sent to the 33784. All of these
commands can be sent in long-word format (standard or
enhanced). Some of the commands can be sent in short-
word format (standard or enhanced), but not all. Refer to the
table in each section for the available formats for each
command. The responses for each command can also be
found in the tables. The 4-bit CRC, which is appended to
every command and every response, has been omitted.
to 0 or 1 without affecting the command. Although the 33784
will respond the same in either case, it is recommended that
all “don't-care” bits be set to 0 to maintain future compatibility.
INITIALIZATION COMMAND AND RESPONSE
(BUSIN INPUT ONLY)
Initialization Command must be sent to the 33784 before it
REQUEST STATUS COMMAND AND RESPONSE
status of the BSH and BSL bits and the logic levels of the I /
O. The command format is found in
18
33784
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Normally enhanced long responses will be sent for
The following sections describe in detail each of the
Many commands have “don't-care” bits, which can be set
Following power-up or after a POR has occurred, the
This command causes the addressed device to return the
A3
Legend
A [3:0] = Address bits. The slave address.
An address value of 0000 is ignored by all devices (no
initialization, no bus switch closure, and no response)
BSH = High Side Bus Switch Position (1 = closed).
BSL = Low Side Bus Switch Position (1 = closed).
“–” = Don’t care bit. Can be 0 or 1.
–
BSH BSL
A2
A1
OD
A0
Data
PA3 PA2 PA1 PA0
0
Figure
Figure 9. Initialization Command Response Format
0
LOGIC COMMANDS AND REGISTERS
0
10.
Response
0
A3
0
BSH BSL
A2
Address
No Response
A1
Not Valid
PA [3:0] = Bus address to set the device to.
An address value of 0000 is ignored by all devices (no
initialization, no bus switch closure, and no response)
OD = Oscillator dither:
enhanced long word, or two enhanced short words of
different lengths are sent in succession, then the first
response will have a different length than the second
command, and therefore the first response will be invalid.
will respond to other commands. The command format is
found in
daisy chain device. The Initialization Command is sent to
address zero. The command will be received by the next
daisy chain device with its bus switch open. Reception of this
command will assign the device address and close the bus
switch if the BSH and BSL bits are logic [1]
will ignore further initialization commands unless it has
received a clear command or undergone a power-ON reset.
valid Initialization Command to the addressed device. The
response is shown in
only command, there is no short word response. The BSH
and BSL bits returned are the same as the bits sent in the
command. The Request Status command can be used to find
the logic commanded state of the bus switches.
in the command match the address that the device was
initialized with. If the addresses do not match, the device will
do nothing and no response will be generated.
0 = no dither (default)
1 = dither
No Response
The Initialization Command may be used to initialize a
Once a device has received an Initialization Command, it
The response is sent during the next message following a
The 33784 will only act on this command if the address bits
A0
Not Valid
0
Figure
PA3 PA2 PA1 PA0
0
Command
9.
0
Figure
0
Analog Integrated Circuit Device Data
0
9. Because this is a long-word
Freescale Semiconductor
SW & ESW (8-bit)
SW & ESW (8-bit)
ESW (10-bit)
ESW (10-bit)
Word Type
Word Type
LW
LW