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
204 / 205
10.12 General purpose I/O port pins ......................... 62
10.12.1 GPIO register descriptions .............................. 62
10.12.1.1 General Purpose I/O ........................................64
10.12.1.2 Port A data register (PTAD) ............................ 65
10.12.1.3 Port A pin pull enable register (PTAPE) ...........66
10.12.1.4 Port A data direction register (PTADD) ............66
10.12.1.5 Port B data register (PTBD) ............................ 67
10.12.1.6 Port B pin pull enable register (PTBE) .............67
10.12.1.7 Port B data direction register (PTBDD) ............67
10.12.2 External wake-up functions ............................. 68
10.12.2.1 KBI status and control register (KBISC) ...........68
10.12.2.2 Keyboard interrupt pin enable register
(KBIPE) ............................................................69
10.12.2.3 Keyboard interrupt edge select register
(KBIES) ............................................................69
10.12.2.4 Ext. interrupt status and control register
(IRQSC) ........................................................... 70
10.13 Timer pulse-width module ............................... 71
10.13.1 TPM1 configuration information .......................72
10.13.1.1 Block diagram ..................................................72
10.13.2 External signal description ...............................73
10.13.3 TPM register descriptions ................................73
10.13.3.1 Timer status and control register (TPMSC) ......73
10.13.3.2 Timer counter high and low registers
(TPMCNTH/L) ..................................................74
10.13.3.3 Timer modulo high and low registers
(TPMMODH/L) ................................................. 75
10.13.3.4 Timer channel 0/1 status and control
registers (TPMCySC) .......................................75
10.13.3.5 Timer channel 0/1 value registers
(TPMCyVH/L) ...................................................77
10.14 Periodic wake-up timer module ....................... 78
10.14.1 PWU timer register descriptions ...................... 79
10.14.1.1 Periodic wake-up status and control register
(PWUSR) ......................................................... 79
10.14.1.2 Periodic wake-up divider register (PWUDIV) ....80
10.14.1.3 Periodic wake-up interrupt register
(PWUCS0) ....................................................... 80
10.14.1.4 Periodic wake-up reset register (PWUCS1) .....81
10.14.1.5 Periodic wake-up counter register (PWUS) ..... 81
10.15 Low frequency (LF) receiver module ............... 82
10.15.1 Features ...........................................................83
10.15.2 Modes of operation ..........................................83
10.15.3 Power management .........................................83
10.15.4 Input amplifier .................................................. 84
10.15.5 LFR data mode states ..................................... 84
10.15.6 Carrier detect ...................................................84
10.15.7 Auto-zero sequence .........................................87
10.15.8 Data recovery .................................................. 87
10.15.9 Data clock recovery and synchronization ........ 87
10.15.10 Manchester decode ......................................... 87
10.15.11 Duty cycle for data mode ................................ 88
10.15.12 Input signal envelope .......................................89
10.15.13 Telegram verification ....................................... 89
10.15.14 Error detection and handling ........................... 91
10.15.15 Continuous ON mode ...................................... 91
10.15.16 Initialization information ................................... 91
10.15.17 LF receiver module register descriptions ......... 92
10.15.17.1LF control 1 register (LFCTL1) ........................ 92
10.15.17.2LF control 2 register (LFCTL2) ........................ 93
10.15.17.3LF control 3 register (LFCTL3) ........................ 94
10.15.17.4LF control 4 register (LFCTL4) ........................ 96
10.15.17.5LF receiver status register (LFS) ..................... 97
10.15.17.6LF received data register (LFDATA) ................99
10.15.17.7LF receiver ID registers (LFID) ........................ 99
10.15.17.8LF receiver control E register (LFCTRLE) ......100
10.15.17.9LF receiver control D register (LFCTRLD) ..... 101
10.15.17.10LF receiver control C register (LFCTRLC) ..... 102
10.15.17.11LF receiver control B register (LFCTRLB) ......103
10.15.17.12LF receiver control A register (LFCTRLA) ......104
10.16 Radio frequency (RF) transmitter module ...... 104
10.16.1 RF data modes ..............................................105
10.16.1.1 RF data buffer mode ..................................... 105
10.16.1.2 MCU direct mode .......................................... 106
10.16.2 RF output buffer data frame .......................... 107
10.16.2.1 Data buffer length ..........................................107
10.16.2.2 End of Message (EOM) .................................107
10.16.3 RF transmission randomization ..................... 107
10.16.3.1 Initial time interval ..........................................108
10.16.3.2 Interframe time intervals ................................ 108
10.16.3.3 Base time interval ..........................................109
10.16.3.4 Pseudo-random time interval .........................109
10.16.3.5 Frame number time ....................................... 110
10.16.4 RFM in STOP1 mode .................................... 111
10.16.5 Data encoding ............................................... 111
10.16.5.1 Manchester encoding .................................... 111
10.16.5.2 Bi-Phase encoding .........................................112
10.16.5.3 NRZ encoding ................................................112
10.16.6 RF output stage .............................................114
10.16.6.1 Modulation method ........................................ 114
10.16.6.2 Carrier frequency ...........................................114
10.16.6.3 RF power output ............................................114
10.16.6.4 Transmission error .........................................115
10.16.6.5 Supply voltage check during RF
transmission ...................................................115
10.16.6.6 RF Reset (RFMRST) ..................................... 115
10.16.7 RF interrupt ....................................................115
10.16.8 Datagram transmission times ........................ 115
10.16.9 Pre-charge function ....................................... 116
10.16.10 VCO calibration machine ...............................116
10.16.11 RFM register descriptions ..............................117
10.16.11.1RFM control 0 register (RFCR0) ....................117
10.16.11.2RFM control 1 register (RFCR1) ....................118
10.16.11.3RFM control 2 register (RFCR2) ....................119
10.16.11.4RFM control 3 register (RFCR3) ....................120
10.16.11.5RFM control 4 register (RFCR4) ....................120
10.16.11.6RFM control 5 register (RFCR5) ....................121
10.16.11.7RFM control 6 register (RFCR6) ....................121
10.16.11.8RFM control 7 register (RFCR7) ....................122
10.16.11.9RFM phase lock loop control registers 0
through 3 (PLLCR0 / PLLCR1 / PLLCR2 /
PLLCR3) ........................................................ 123
10.16.11.10RFM transmit data 0 through 31 registers
(RFTX0 : RFTX31) ........................................ 125
10.16.11.11RFM EOM, PLL and PA control register
(EPR) ............................................................. 129
10.16.11.12RFM Pre-charge control register
(RFPRECHARGE) ......................................... 130
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