LOGIC COMMANDS AND REGISTERS Figure 13. Requ" />
參數(shù)資料
型號: MCZ33784EFR2
廠商: Freescale Semiconductor
文件頁數(shù): 14/30頁
文件大小: 0K
描述: IC SENSOR DBUS DSI 2.02 16-SOIC
標準包裝: 2,500
類型: 傳感器接口
輸入類型: 模擬
輸出類型: 數(shù)字
接口: 總線
電流 - 電源: 4mA
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
供應商設備封裝: 16-SOIC N
包裝: 帶卷 (TR)
Analog Integrated Circuit Device Data
Freescale Semiconductor
21
33784
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Figure 13. Request AN1 Command and Response Format
I/O CONTROL COMMAND AND RESPONSE
This command can be used to configure the direction of
the I/O pins, and force their states if configured as outputs.
Refer to Figure 14 for the command and response format.
The response is sent during the next message following a
valid I/O Control command to the addressed device. Because
this is a long-word only command, there is no short word
response.
The direction (DR) bits are used to specify the direction
(input or output) of each pin independently. If the DR bit for a
specific I/O pin is set to 1, then that I/O pin will be an output
and the state of the level (Lx) bit will determine whether the
pin is driven high or low. If the DR bit for a specific I/O pin is
set to 0, then that pin will be an input and the Lx bit in the
command will have no affect on the state of the pin.
In the response to the I/O Control Command, the DR bits
will show the direction that the pins were programmed. The
Lx bits will have the values that were set in the command.
These values may not reflect the actual states of the pins. To
obtain the accurate states of the pins, the Request Status
Command should be used.
The 33784 will only act on the I/O Control Command if the
address bits in the command match with the address that the
device was initialized. If the addresses do not match, the
device will do nothing and no response will be generated.
Address ‘0000’ is a global command. All slaves in the
signal path will configure their I/O pins according to the state
of the data bits. No response results from the I/O control
global command.
Data
Address
Command
Word Type
––––––––
A3
A2
A1
A0
0101
LW & ELW
A3
A2
A1
A0
0101
SW & ESW (8-bit)
––
A3
A2
A1
A0
0101
ESW (10-bit)
Response
Word Type
A3
A2
A1
A0
0000
B9
B8
B7
B6
B5
B4
B3
B2
LW & ELW
B9
B8
B7
B6
B5
B4
B3
B2
SW & ESW (8-bit)
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
ESW (10-bit)
Legend
A[3:0] = Address bits. The address of the selected device.
An address value of 0000 is ignored by all devices.
“–” = Don’t care bit. Can be 0 or 1.
B[9:0] = Measured value.
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