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)： 74/162頁
文件大?。?/td> 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
Freescale Semiconductor
19
4.4
MCU Parameter Registers
The 32 bytes of parameter registers are located at addresses $0040 through $005F. These registers are powered up at all times
and may be used to store temporary or history data during the times when the MCU is in any of the stop modes. The register at
location $005F is used for interrupt flags by the firmware provided by Freescale. The assignment of the bits in location $005F are
described in the Codewarrior project files supplied by Freescale.
4.5
RAM
The MPXY8300 Series includes static RAM. The locations in RAM below 0x0100 can be accessed using the more efficient direct
addressing mode, and any single bit in this area can be accessed with the bit manipulation instructions (BCLR, BSET, BRCLR,
and BRSET). Locating the most frequently accessed program variables in this area of RAM is preferred.
The RAM retains data when the MCU is in low-power wait stop2, stop3 or stop4 modes. At power-on or after wake-up from stop1,
the contents of RAM are uninitialized. RAM data is unaffected by any reset provided that the supply voltage does not drop below
the minimum value for RAM retention (VRAM).
For compatibility with older M68HC05 MCUs, the HCS08 code in the device resets the stack pointer to 0x00FF. It is usually best
to re initialize the stack pointer to the top of the RAM so the direct page RAM can be used for frequently accessed RAM variables
and bit-addressable program variables. Include the following 2-instruction sequence in your reset initialization routine (where
RamLast is equated to the highest address of the RAM in the equate file in the Codewarrior project file provided by Freescale).
LDHX
#RamLast+1
;point one past RAM
TXS
;SP<-(H:X-1)
When security is enabled, the RAM is considered a secure memory resource and is not accessible through BDM or through code
executing from non-secure memory. See Section 4.6 for a detailed description of the security feature.
None of the RAM locations are used directly by the firmware provided by Freescale. The firmware routines utilize RAM only
through stack operations; and the user needs to be aware of stack depth required by each routine as described in the Codewarrior
project files supplied by Freescale.
4.6
FLASH
The FLASH memory is intended primarily for program storage. In-circuit programming allows the operating program to be loaded
into the FLASH memory after final assembly of the application product. It is possible to program the entire array through the
single-wire background debug interface. Because no special voltages are needed for FLASH erase and programming operations,
in-application programming is also possible through other software-controlled communication paths. For a more detailed
discussion of in-circuit and in-application programming, refer to the HCS08 Family Reference Manual, Volume I, Freescale
document order number HCS08RMV1/D.
$1819
–
$181F
Reserved
—
$1820
FCDIV
DIVLD
PRDIV8
DIV5
DIV4
DIV3
DIV2
DIV1
DIV0
$1821
FOPT
KEYEN
FNORED
0
SEC01
SEC00
$1822
Reserved
—
$1823
FCNFG
0
KEYACC
0
$1824
FPROT
FPS7
FPS6
FPS5
FPS4
FPS3
FPS2
FPS1
FPDIS
$1825
FSTAT
FCBEF
FCCF
FPVIOL
FACCERR
0
FBLANK
0
$1826
FCMD
FCMD7
FCMD6
FCMD5
FCMD4
FCMD3
FCMD2
FCMD1
FCMD0
$1827
–
$182B
Reserved
—
NOTES:
1. Bit 1 in $1809 is a reserved bit which must always be written to 0.
Table 4-3 MCU High Address Register Summary (Continued)
Address
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
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相關代理商/技術參數(shù)
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