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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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PN746X Fiches technique(PDF) 36 Page - NXP Semiconductors |
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PN746X Fiches technique(HTML) 36 Page - NXP Semiconductors |
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36 / 86 page  PN746X_736X All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved. Product data sheet COMPANY PUBLIC Rev. 3.1 — 5 April 2016 369231 36 of 86 NXP Semiconductors PN746X_736X NFC Cortex-M0 microcontroller 8.11.2 Features of timer 2 and timer 3 • 32-bit counters • 1 match register per timer, no capture registers and capture trigger pins are needed • 1 common output line gathering four timers (Timer 0, Timer 1, Timer 2, and Timer 3) • Interrupts • Timer 2 and timer 3 have two count modes: single-shot and free-running • Timer 2 and timer 3 time-out interrupts can be individually masked • Timer 2 and timer 3 clock source is the system clock 8.12 System tick timer The PN7462 microcontroller includes a system tick timer (SYSTICK) that generates a dedicated SYSTICK exception at a fixed time interval (10 ms). 8.13 Watchdog timer If the microcontroller enters an erroneous state, the watchdog timer resets the microcontroller. When the watchdog timer is enabled, if the user program fails to “feed” (reload) the watchdog timer within a predetermined time, it generates a system reset. The watchdog timer can be enabled through software. If there is a watchdog timeout leading to a system reset, the timer is disabled automatically. • 10-bit counter • Based on a 2.85 kHz clock • Triggers an interrupt when a predefined counter value is reached • Connected to the ARM subsystem NMI (non-maskable interrupt) • If the watchdog timer is not periodically loaded, it resets PN7462 8.14 Clocks The PN7462 clocks are based on the following clock sources: • 27.12 MHz external quartz • 27.12 MHz crystal oscillator • Internal oscillator: 20 MHz High Frequency Oscillator (HFO) • Internal oscillator: 365 kHz Low Frequency Oscillator (LFO) • Internal PLL at 48 MHz for the USB interface Figure 23 indicates the clocks used by each IP. |
Numéro de pièce similaire - PN746X |
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Description similaire - PN746X |
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