參數(shù)資料
型號(hào)： PPXY8300A6T1
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： Pressure Sensor
英文描述： DIFFERENTIAL, PEIZORESISTIVE PRESSURE SENSOR, RECTANGULAR, SURFACE MOUNT
封裝： SOIC-20
文件頁數(shù)： 3/162頁
文件大小： 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
100
Freescale Semiconductor
12.7
Initialization Information
12.7.1
Carrier Detect Mode Initialization
In carrier detect mode the user is normally just searching for a signal of certain amplitude, carrier frequency, and duration. After
this has been detected, other activity such as taking a pressure reading and/or transmitting information over an RF link can be
initiated.
The wake-up code registers are not used in carrier detect mode. They can remain uninitialized. If the user needs a few extra
bytes of RAM, LFCA0:1 and LFCB0:1 can be used to store variables. The LFDATA data register is not used in carrier detect mode
either, but it is read only and therefore has no useless purpose in this mode.
The LFR control and status registers must be setup as defined on a bit by bit basis in Table 12-11. All control bits must be set
prior to setting LFEN = 1 and enabling the module.
5
LFCF
LFR Carrier Flag — The LFCF bit indicates whether the received LF has lasted longer than the tCD time set by
the LFCT bit.
0
Carrier is no longer present and acknowledged.
1
Carrier has lasted after tCD.
4
LFCFAK
LFR Carrier Flag Acknowledge — The LFCFAK bit resets the LFCF flag bit.
0
No effect.
1
Reset the LFCF flag bit.
3
LFBF
Wake-Up Code Flag B — The LFBF bit indicates when a Manchester datagram has been properly accepted
and contains a wake-up code B.
0
LF wake data B not matched or previously acknowledged.
1
LF data matches wake-up code B.
2
LFAF
Wake-Up Code Flag A — The LFAF bit indicates when a Manchester datagram has been properly accepted
and contains the wake-up code A.
0
LF wake data A not matched or previously acknowledged.
1
LF data matches wake-up code A.
1
MDDO
Manchester Data Detect Out — The MDDO bit gives the received Manchester data validity after the successful
match in wake-up code. This bit is cleared when the LFR detector is turned off (LFEN bit is cleared).
0
It indicates that received Manchester data is valid (no Manchester code violation).
1
It indicates that received Manchester data is not valid (Manchester code violation) and therefore this is the
end of the LF data frame.
0
LFIG
Ignore LFR Detector Output — This control bit causes the LFR decoder to ignore any sampled outputs from
the LFR detector.
0
No effect.
1
The LFR detector output is held low during the LFR sample time.
Table 12-10 LFCS1 Register Field Descriptions (Continued)
Field
Description
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