參數(shù)資料
型號(hào)： PPXY8300A6T1
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： Pressure Sensor
英文描述： DIFFERENTIAL, PEIZORESISTIVE PRESSURE SENSOR, RECTANGULAR, SURFACE MOUNT
封裝： SOIC-20
文件頁(yè)數(shù)： 4/162頁(yè)
文件大?。?/td> 4316K
代理商： PPXY8300A6T1
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MPXY8300 Series
Sensors
Freescale Semiconductor
101
12.7.2
Manchester Data Mode Initialization
In Manchester data mode, several bytes of information including a synchronization character, a message ID and optional data
are being received. Only the optional data packet is passed to the CPU through the LFDATA register. The data can prompt the
CPU to take certain actions which might include: change sampling period, change wake-up ID, echo AGC level via RF link, take
pressure reading, set critical pressure point, or transmit certain pieces of information.
The wake-up code must be initialized in Manchester mode or no information will ever be received. This must be done prior to
enabling the module. 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 12-12. All control bits must be set prior to setting LFEN = 1 and
enabling the module.
Table 12-11 Carrier Mode Control and Status Register Initialization
Register
Bit
Position
Bit Name
Control
/Status
Use and Initialization Comments
Initial
Binary
Value
LFCR
= 0x 45
7,6
LFM1:0
C
Select carrier detect mode = 0:1.
01
5
LFCT
C
Choice of long or short minimum character length.
0 = short (~ 88
μsec) and 1 = long (~ 176 μsec). Select short.
0
4
LFON
C
Set length of sample time.
0 = short (~200
μsec) and 1 = long (~2120 μsec). Select short.
0
3-0
LFS[3:0]
C
Sample rate select. Select to sample every 32 msec.
0101
LFCS0
= 0x 5A
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 detects a valid carrier signal.
1
5
LFOFF
S (R only)
Not applicable to carrier detect mode.
d (0)
4
LFRST
C
Sets how long the LF module will be disabled between sam-
ples. 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
Not applicable to carrier detect mode.
d (0)
1
LFLVL
C
Will set for low sensitivity. If nothing is seen for a very long
period, it can be switched to high sensitivity.
1
0
LFAGC
C
Not applicable to carrier detect mode.
d (0)
LFCS1
= 0x 50
7
LFDF
S (R only)
Not applicable to carrier detect mode.
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)
This bit must be monitored in the carrier detect mode.
d (0)
4
LFCFAK
C
Reset the LFCF flag.
1
3
LFBF
S (R only)
Not applicable to carrier detect mode.
d (0)
2
LFAF
S (R only)
Not applicable to carrier detect mode.
d (0)
1
MDD0
S (R only)
Not applicable to carrier detect mode.
d (0)
0
LFIG
C
Detector output must be monitored.
0
Table 12-12 Manchester Data Mode Control and Status Register Initialization
Register
Bit
Position
Bit Name
Control
/Status
Use and Initialization Comments
Initial
Binary
Value
LFCR
= 0x 84
7,6
LFM1:0
C
Select Manchester data mode = 1:0
1:0
5
LFCT
C
Not applicable to Manchester data mode.
d (0)
4
LFON
C
No action required. In Manchester data mode, the LFON time
is automatically set to 2 LFO clocks = ~2 msec.
0
3-0
LFS[3:0]
C
Sample rate select. Choose sample every 16 msec.
0100
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