NXP Semiconductors UM11227 - Tab. 207. FRC Compare Low Register (FRCCOMP1) (Address $1884); Tab. 208. FRCCOMP2;1 Register Field Descriptions; Other MCU Resources

NXP Semiconductors
UM11227
NTM88 family of tire pressure monitor sensors
UM11227 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 6 — 24 April 2020
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Bit 15 14 13 12 11 10 9 8
POR ($FF) 1 1 1 1 1 1 1 1
Other
resets
U U U U U U U U
Table 207. FRC compare low register (FRCCOMP1) (address $1884)
Bit 7 6 5 4 3 2 1 0
R
W
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
POR ($FF) 1 1 1 1 1 1 1 1
Other
resets
U U U U U U U U
Table 208. FRCCOMP2/1 register field descriptions
Field Description
15:0
FRCCO
MP2/1
The 16-bit FRC compare register holds the value of the target comparison for which the interrupt will occur if
enabled.
$FFFF = Result of Reset
10.26 Other MCU resources
NXP provides a CodeWarrior starter project and a library of the firmware routines,
including a user manual, available for download. Customer software applications are
developed from the starter project, including the specific firmware routines from the
library as needed.
It is not intended that physical parameter measurements be made during the time that
LFR may be actively receiving/decoding LF signals; or during the time that the RFM
may be actively powered up and/or transmitting RF data. The resulting interactions will
degrade the accuracy of the measurements.
The NTM88 measures six physical parameters for use in the tire pressure monitoring
application: pressure, temperature, battery voltage, two external voltages and an optional
X- and/or Z-axis acceleration. Each parameter is accessed in a different manner and all
use firmware subroutine calls as described in the firmware user guide. These subroutines
initialize some control bits within the sensor measurement interface, SMI, and then place
the MCU into the STOP4 mode until the measurement is completed with an interrupt
back to the MCU.
The accuracy, power consumption, and timing specified for any measurement provided
in the data sheet are only guaranteed if the user obtains a reading using the specified
firmware subroutine call in firmware user guide. For additional information, contact your
NXP sales representative.
The NTM88 uses a 6-channel, 10-bit analog-to-digital converter (ADC10) module. The
ADC10 module is an analog-to-digital converter using a successive approximation
register (SAR) architecture with sample and hold. Capture of pressure and acceleration
sensor readings is controlled by the sensor measurement interface (SMI) and capture of
temperature and voltage readings are controlled by the MCU.