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參數(shù)資料
| 型號： | 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)： | 145/162頁 |
| 文件大?。?/td> | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
Freescale Semiconductor
83
SECTION 11 PERIODIC WAKE-UP TIMER
The periodic wake-up timer (PWU) generates a periodic interrupt to wake-up the MCU from any of the low power modes. It also
has an optional periodic reset to restart the MCU. It is driven by the LFO oscillator in the RTI module which generates a clock at
a nominal one millisecond interval. The LFO and the wake-up timer are always active and cannot be powered off by any software
control. The control bits are set so that there is either a periodic wake-up, a periodic reset, or both a wake-up interrupt and a
periodic reset. No combination of control bits will disable both the wake-up interrupt and the periodic reset. In addition, there is
no hardware control that can mask a wake-up interrupt once it is generated by the PWU.
11.1
Block Diagram
The block diagram of the wake-up timer is shown in Figure 11-1. This consists of a programmable pre-scaler with 64 steps that
can be used to adjust for variations in the value of the LFO period. Finally there are two cascaded programmable 6-bit dividers
to set wake-up and/or reset time intervals.
Figure 11-1 Wake-Up Timer Block Diagram
The wake-up divider (PWUDIV) register selects a division of the incoming 1 msec clock to generate a wake-up clock, WCLK. The
WCLK frequency can be calibrated against the more precise external oscillator using the TCAL firmware subroutine as described
in Section 14. This subroutine turns on the RFX crystal oscillator and feeds a 500 kHz clock to the TPM1 via the internal Dx signal
for one cycle of the LFO. The measured time is used to calculate the correct value for the WDIV0:5 bits for a WCLK period of 1
second. The TCAL subroutine cannot be used while the RFX is transmitting or the TPM1 is being used for another task.
The wake-up time register (PWUSC0) selects the number of WCLK pulses that are needed to generate a wake-up interrupt to
the MCU. The periodic reset register (PWUSC1) selects the number of wake-up pulses that are needed to generate a periodic
reset of the MCU. If both the reset and the interrupt occur on the same clock cycle the reset will have precedence and the interrupt
will not be generated.
NOTE
The wake-up interrupt (WUKI) cannot be masked by any hardware control. Therefore clearing the I-bit will not
prevent a wake-up interrupt.
CONTROL
LOGIC
LFO
6-BIT
WAKE-UP
WUF
PROGRAMMBLE
PRESCALER
WDIV0:5
WUT0:5
WUKI
PRST0:5
DIVIDER
6-BIT
PERIODIC
RESET
WCLK
RCLK
DIVIDER
PRF
PRST
WUFACK
PRFACK
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