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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)： | 2/162頁 |
| 文件大?。?/td> | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
10
Freescale Semiconductor
SECTION 3 MODES OF OPERATION
The operating modes of the MPXY8300 Series are described in this section. Entry into each mode, exit from each mode, and
functionality while in each of the modes are described.
3.1
Features
Active background debug mode for code development
Wait mode:
–
CPU shuts down to conserve power
–
System clocks continue running
–
Full voltage regulation is maintained
Stop modes:
–
System clocks stopped
–
Stop1 — Power down of most internal circuits, including RAM, for maximum power savings; voltage regulator in standby
–
Stop2 — Power down of most internal circuits; voltage regulator in standby; RAM maintained in loose regulation
–
Stop3 — All internal circuits powered; voltage regulator in standby with loose regulation
–
Stop4 — All internal circuits powered and full voltage regulation maintained for fastest recovery
3.2
Run Mode
This is the normal operating mode for the device. This mode is selected when the BKGD pin is high at the rising edge of reset.
In this mode, the CPU executes code from internal memory following a reset with execution beginning at address $C000.
3.3
Active Background Mode
The active background mode functions are managed through the background debug controller (BDC) in the HCS08 core. The
BDC, together with the on-chip debug module (DBG), provide the means for analyzing MCU operation during software
development.
Active background mode is entered in any of five ways:
When the BKGD pin is low at the rising edge of a power up reset
When a BACKGROUND command is received through the BKGD pin
When a BGND instruction is executed by the CPU
When encountering a BDC breakpoint
When encountering a DBG breakpoint
Once in active background mode, the CPU is held in a suspended state waiting for serial background commands rather than
executing instructions from the user’s application program. Background commands are of two types:
Non-intrusive commands, defined as commands that can be issued while the user program is running. Non-intrusive
commands can be issued through the BKGD pin while the MCU is in run mode; non-intrusive commands can also be
executed when the MCU is in the active background mode. Non-intrusive commands include:
–
Memory access commands
–
Memory-access-with-status commands
–
BDC register access commands
–
The BACKGROUND command
Active background commands, which can only be executed while the MCU is in active background mode. Active
background commands include commands to:
–
Read or write CPU registers
–
Trace one user program instruction at a time
–
Leave active background mode to return to the user’s application program (GO)
The active background mode is used to program a bootloader or user application program into the FLASH program memory
before the MCU is operated in run mode for the first time. When the device is shipped from the Freescale factory, the FLASH
program memory is erased by default (unless specifically requested otherwise) so there is no program that could be executed in
run mode until the FLASH memory is initially programmed.
The active background mode can also be used to erase and reprogram the FLASH memory after it has been previously
programmed.
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