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PXN20RM Datasheet, PDF (135/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller | |||
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Clocks, Reset, and Power (CRP)
â Four selectable counter clock sources
â 4 â 40 MHz XTAL with 1 to 16 divider
â 32 kHz XTAL
â 16 MHz_IRC with 1 to 16 divider stage
â 128 kHz_IRC with 1 to 4 divider stage
â Optional divide-by-512 prescaler and optional divide-by-32 prescaler connected in series in the
clock path feeding the 32-bit counter
â 32-bit counter supports times up to greater than 1.5 months with 1 ms resolution.
â 12-bit compare value to support interrupt intervals of 1 s up to greater than 1 hr with 1 s
resolution
â RTC interrupt with interrupt enable.
â Counter runs in all modes of operation.
â RTC status and control register are reset only by POR
â RTC counter is reset when counter is disabled by software and by POR.
â Autonomous periodic interrupt support includes:
â 10-bit compare value to support wakeup intervals of 1.0 ms to 1 s
â Wakeup logic has separate enable to support changing compare value while RTC running
â API interrupt with interrupt enable
â Operates in all modes of operation
â API compare value can be modified while RTC is running
â Optional interrupt for RTC match, API match, and RTC rollover.
⢠Low-power mode management:
â Provides control of voltage regulator, LVI circuits, isolation enables, and power switches
â FSM clock gates itself off when waiting for asynchronous wakeup signal for power savings
â Four selections available for block sizes for RAM data retention (0, 32 KB, 64 KB, and
128 KB)
⢠Low-power wakeup:
â Wakeup sources can be either the RTC, API, RTC rollover, or external pin
â All wakeup sources can be enabled at any given time (first to occur generates wakeup)
â 32 pin wakeup sources
â Pin wakeup occurs on rising edge, falling edge, or both
â Two clock-source inputs for pin wakeup to allow for lower power or faster wakeup
â System level reset control to ensure clean recovery from sleep mode
⢠Miscellaneous:
â All functional logic inputs isolated in low-power modes
â All logic with multiple clock sources internally synchronized
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
6-3
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