PXD20RM Datasheet, PDF (54/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

• Clock Generation Module (MC_CGM) to generate system clock sources and provide a unified
register interface, enabling access to all clock sources
• Clock Monitor Unit (CMU)
— Monitors the integrity of the fast (4–16 MHz) external crystal oscillator and the primary
FMPLL (FMPLL0)
— Acts as a frequency meter, measuring the frequency of one clock source and comparing it to a
reference clock
• Mode Entry Module (MC_ME)
— Controls the device power mode, i.e., RUN, HALT, STOP, or STANDBY
— Controls mode transition sequences
— Manages the power control, voltage regulator, clock generation and clock management
modules
• Power Control Unit (MC_PCU) to implement standby mode entry/exit and control connections to
power domains
• Reset Generation Module (MC_RGM) to manage reset assertion and release to the device at initial
power-up
• Nexus Development Interface (NDI) per IEEE-ISTO 5001-2008 Class 3 standard with additional
Class 4 features:
— Watchpoint Triggering
— Processor Overrun Control
• Device/board boundary-scan testing supported per Joint Test Action Group (JTAG) of IEEE (IEEE
1149.1)
• On-chip voltage regulator controller for regulating the 3.3–5 V supply voltage down to 1.2 V for
core logic (requires external ballast transistor)
• Package:¹
— 176 LQFP, 0.5 mm pitch, 24 mm  24 mm outline
— 208 LQFP, 0.5 mm pitch, 28 mm  28 mm outline
— 416 TEPBGA, 1mm ball pitch, 27 mm  27 mm outline
1.5 Feature details
1.5.1 Low-power operation
The PXD20 is designed for optimized low-power operation and dynamic power management of the CPU
and peripherals. Power management features include software-controlled clock gating of peripherals and
multiple power domains to minimize leakage in low-power modes.
There are three low-power modes:
1. See the device comparison table for package offerings for each device in the family.
PXD20 Microcontroller Reference Manual, Rev. 1
1-6
Freescale Semiconductor
Preliminary—Subject to Change Without Notice