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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)： | 13/162頁 |
| 文件大小： | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
Freescale Semiconductor
11
3.4
Wait Mode
Wait mode is entered by executing a WAIT instruction. Upon execution of the WAIT instruction, the CPU enters a low-power state
in which it is not clocked. The I bit in CCR is cleared when the CPU enters the wait mode, enabling interrupts. When an interrupt
request occurs, the CPU exits the wait mode and resumes processing, beginning with the stacking operations leading to the
interrupt service routine.
While the MCU is in wait mode, there are some restrictions on which background debug commands can be used. Only the
BACKGROUND command and memory-access-with-status commands are available when the MCU is in wait mode. The
memory-access-with-status commands do not allow memory access, but they report an error indicating that the MCU is in either
stop or wait mode. The BACKGROUND command can be used to wake the MCU from wait mode and enter active background
mode.
3.5
Stop Modes
One of four stop modes is entered upon execution of a STOP instruction when the STOPE bit in the system option register is set.
In all stop modes, all internal clocks are halted except for the low frequency 1 kHz oscillator (LFO) which runs continuously
whenever power is applied to the VDD and VSS pins. If the STOPE bit is not set when the CPU executes a STOP instruction, the
MCU will not enter any of the stop modes and an illegal opcode reset is forced. The stop modes are selected by setting the
appropriate bits in SPMSC2. Table 3-1 summarizes the behavior of the MCU in each of the stop modes.
3.5.1
Stop1 Mode
The stop1 mode provides the lowest possible standby power consumption by causing the internal circuitry of the MCU to be
powered down.
When the MCU is in stop1 mode, all internal circuits that are powered from the voltage regulator are turned off. The voltage
regulator is in a low-power standby state. Exit from stop1 is done by asserting either a reset or an interrupt function to the MCU.
Entering stop1 mode automatically asserts LVD. Stop1 cannot be exited until VDD>VLVDH/L rising (VDD must rise above the LVI
re-arm voltage).
Upon wake-up from stop1 mode, the MCU will start up as from a power-on reset (POR) by taking the reset vector.
NOTE
Specific to the tire pressure monitoring application the parameter registers and the LFO with wake-up timer are
powered up at all times whenever voltage is applied to the supply pins. The LFR detector and MFO may be
periodically powered up by the LFR decoder.
Table 3-1 Stop Mode Behavior
Mode
Stop1
Stop2
Stop3
Stop4
LFO Oscillator, PWU
Always On & Clocking
MFO Oscillator(1)
Optionally On
HFO Oscillator
Off
CPU
Off
Standby
RAM
Off
Standby
Parameter Registers
On
FLASH
Off
Standby
TPM1 2 Chan TImer/PWM
Off
Digital I/O
Off
Standby
P-Chip Interface (PCI)
Off
Standby
Optionally On
P-Chip
Off
Standby
Optionally On
Acceleration Interface (ACI)
Off
Standby
Optionally On
Acceleration g-cells
Off
Standby
Optionally On
Temperature Sensor (in ADC10)
Off
Optionally On(4)
Normal Temperature Restart
Optionally On
Voltage Reference (in ADC10)
Off
Optionally On(4)
Optionally On(4)
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