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)： 27/162頁
文件大?。?/td> 4316K
代理商： PPXY8300A6T1
MPXY8300 Series
Sensors
122
Freescale Semiconductor
SECTION 14 FIRMWARE
This section describes the software subroutines contained in the firmware section of the FLASH memory that the user can call
for various tasks and to reduce the software development time for the main internal operations.
14.1
Software Jump Table
All subroutines are accessed through a jump table located at the top of the FLASH firmware memory. This allows upgrades in
firmware without changing the software code of the user. All subroutines should be accessed with the JSR instruction.
14.2
Function Documentation
The following subsections describe the details of the firmware routines.
14.2.1
General Rules
1.
ADC is totally managed by the firmware
2.
The status byte is updated by each routine. If not read between routine calls the intermediate status may be lost.
3.
No output parameter can use the extreme codes (all zero’s or all one’s).
4.
The all zero’s output code will always indicate a fault and the status byte will indicate the source of the error.
5.
While firmware is processing, CPU resources are unavailable for application.
6.
Each measured parameter will return a limit code ($00, $FF or $1FF) if an error occurs in its acquisition.
14.2.2
Firmware Routines
The details on the use and execution of each firmware routine is documented in the Code Warrior project file that is supplied by
Freescale. Any future updates to these firmware routines will be contained in that file. A summary of the firmware routines
available is given in Table 14-1.
The firmware table is comprised of three-byte entries where the first byte is the operational code for the JMP instruction, and the
following two bytes are the absolute address pointing to the location of the firmware function.
Table 14-1 Firmware Summary and Jump Table
Address
Routine
Description
E000
REIMS_RESET
Master reset
E003
REIMS_ACITD
Acceleration data trim
E006
REIMS_READ_COMP_VOLTAGE
Voltage acquisition
E009
REIMS_READ_COMP_TEMP_8
Temperature acquisition
E00C
REIMS_READ_COMP_PRESSURE
Pressure acquisition
E00F
REIMS_READ_COMP_ACCEL_X
X Acceleration acquisition
E012
REIMS_READ_COMP_ACCEL_Z
Z Acceleration acquisition
E015
REIMS_RF_RESET
Reset the RFX
E018
REIMS_RFRD
Read one RF register
E01B
REIMS_RF_READ_REGISTERS
Read consecutive RF registers
E01E
REIMS_RFWRT
Write one RF register
E021
REIMS_RF_WRITE_REGISTERS
Write consecutive RF registers
E024
REIMS_RF_READ_DATA
Read RFX data buffer
E027
REIMS_RF_READ_DATA_REVERSE
Read RFX data buffer,
bit order transposed
E02A
REIMS_RF_WRITE_DATA
Write RFX data buffer
E02D
REIMS_RF_WRITE_DATA_REVERSE
Write RFX data buffer, bit order transposed
E030
REIMS_RF_XCO_ON
Switch on XCO
E033
REIMS_RF_SET_TX
Send RF data buffer
E036
REIMS_WAVG_2
Weighted average with R=2
E039
REIMS_WAVG_4
Weighted average with R=4
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