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)： 146/162頁
文件大小： 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
84
Freescale Semiconductor
11.2
Wake-Up Divider Register - PWUDIV
The PWUDIV register contains six bits to select the division of the incoming 1 msec clock period as described in Figure 11-2.
11.3
PWU Control/Status Register 0 - PWUCS0
The PWUCS0 register contains six bits to select the division of the incoming WCLK clock period and provide interrupt flag and
acknowledge bits as described in Figure 11-3. The period of the resulting interrupt also generates the clock, RCLK, for the
periodic reset timing.
$0038
Bit 7
6
5
4
3
2
1
Bit 0
R
0
WDIV
W
RESET:
POR:
0
1
Figure 11-2 PWU Divider Register (PWUDIV)
Table 11-1 LFCS1 Register Field Descriptions
Field
Description
7:0
unused
Unused register bits, always read as 0.
5:0
WDIV
Wakeup Divider — These bits select an incoming pre-scaler for the incoming 1 msec clock period from 504 to
1512. This results in a clocking of the 6-bit wake-up divider at rates from a nominal 504 to 1512 msec for each
wake-up clock, WCLK. The user can use this prescaler to fine tune the wake-up time based on the variation in
the LFO frequency. The conversion from the decimal value of the WDIV bits to the nominal WCLK period is
given as:
A power on reset presets these bits to a value of $1F (decimal 31) which yields a nominal 1 second output
period for WCLK. Other resets have no effect on these bits.
$0039
Bit 7
6
5
4
3
2
1
Bit 0
R
WUF
0
WUT5
W
WUFACK
RESET:
0
1
Figure 11-3 PWU Control/Status Register 0 (PWUCS0)
Table 11-2 LFCS1 Register Field Descriptions
Field
Description
7
WUF
Wake-Up Interrupt Flag — The WUF bit indicates when a wake-up interrupt has been generated by the PWU.
This bit is cleared by writing a one to the WUFACK bit. Writing a zero to this bit has no effect. Reset clears this
bit.
0
Wake-up interrupt not generated or was previously acknowledged
1
Wake-up interrupt generated
t
WCLK
504
16
WDIV
×
+
()
1000
--------------------------------------------------
=
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