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)： 5/162頁
文件大?。?/td> 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
102
Freescale Semiconductor
12.7.3
Direct MCU Mode Initialization
In direct MCU mode, received information is analyzed by monitoring the LFDO bit. The detector can be configured for sensitivity
level only. All other configuration choices are either not applicable or defaulted to a certain value. During periods of no activity,
the module needs to be turned off and back on to perform the auto-zero sequence which takes approximately 32
μsec.
The wake-up code registers are not used and do not need to be initialized. The LFDATA register is read only and does not require
any initialization. The LFR control and status registers must be setup as defined on a bit by bit basis in Table 12-13. All control
bits must be set prior to setting LFEN = 1 and enabling the module.
LFCS0
= 0x 55
7
LFDO
S (R only)
Does not need to be initialized.
d (0)
6
LFIE
C
Enable interrupts. This will allow LFR to wake the CPU from
stop mode when LF module receives a data byte in
Manchester datagram.
1
5
LFOFF
S (R only)
Manchester coding error has occurred and LF module is
between sampling intervals.
d (0)
4
LFRST
C
This sets how long the LF module will be disabled between
samples. 0 = 1 sample period, 1 = 2 sample periods.
1
3
LFEN
C
Must be set to 1 for LFR to be enabled during sampling.
1
2
LFWU8
C
In Manchester mode this bit sets wake-up code length,
0 = 8 bits and 1 = 16 bits.
0
1
LFLVL
C
Will start with low sensitivity. If nothing is seen for a very long
period it can be switched to high sensitivity.
1
0
LFAGC
C
Determines if LFDATA reads as AGC level or received data.
0 = data and 1 = AGC. Set for data.
0
LFCS1
= 0x 40
7
LFDF
S (R only)
Read only. Set when data is available in LFDATA reg.
d (0)
6
LFDFAK
C
Upon reset, LFDF, LDBF and LFAF should be clear but it is
recommended to reset them anyway.
1
5
LFCF
S (R only)
Not applicable to Manchester data mode.
d (0)
4
LFCFAK
C
Not applicable to Manchester data mode.
d (0)
3
LFBF
S (R only)
Wakeup code B match.
d (0)
2
LFAF
S (R only)
Wakeup code A match.
d (0)
1
MDD0
S (R only)
Manchester data detect status: 0 = detector receiving data,
1 = detector no longer receiving data.
d (0)
0
LFIG
C
Detector output which must be monitored.
0
Table 12-13 Direct MCU Mode Control and Status Register Initialization
Register
Bit
Position
Bit Name
Control
/Status
Use and Initialization Comments
Initial
Binary
Value
LFCR
= 0x 80
7,6
LFM1:0
C
Select MCU direct mode = 0:0
0:0
5
LFCT
C
Not applicable to direct MCU mode.
d (0)
4
LFON
C
Not applicable to direct MCU mode.
0
3-0
LFS[3:0]
C
Not applicable to direct MCU mode.
d (0000)
Table 12-12 Manchester Data Mode Control and Status Register Initialization (Continued)
Register
Bit
Position
Bit Name
Control
/Status
Use and Initialization Comments
Initial
Binary
Value
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