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MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 1-7
— Maintains system time-of-day clock
— Provides stopwatch and alarm interrupt functions
• Software watchdog timer
— 32-bit counter
— Low-power mode support
• Backup watchdog timer (BWT)
— Independent timer that can be used to help software recover from runaway code
— 16-bit counter
— Low-power mode support
• Clock generation features
— One to 48 MHz crystal, 8 MHz on-chip relaxation oscillator, or external oscillator reference
options
— Trimmed relaxation oscillator
— Two to 10 MHz reference frequency for normal PLL mode with a pre-divider programmable
from 1 to 8
— System can be clocked from PLL or directly from crystal oscillator or relaxation oscillator
— Low power modes supported
—2
n
(n ≤ 0 ≤ 15) low-power divider for extremely low frequency operation
• Interrupt controller
— Uniquely programmable vectors for all interrupt sources
— Fully programmable level and priority for all peripheral interrupt sources
— Seven external interrupt signals with fixed level and priority
— Unique vector number for each interrupt source
— Ability to mask any individual interrupt source or all interrupt sources (global mask-all)
— Support for hardware and software interrupt acknowledge (IACK) cycles
— Combinatorial path to provide wake-up from low-power modes
• DMA controller
— Four fully programmable channels
— Dual-address transfer support with 8-, 16-, and 32-bit data capability, along with support for
16-byte (4×32-bit) burst transfers
— Source/destination address pointers that can increment or remain constant
— 24-bit byte transfer counter per channel
— Auto-alignment transfers supported for efficient block movement
— Bursting and cycle steal support
— Software-programmable DMA requesters for the UARTs (3) and 32-bit timers (4)
•Reset
— Separate reset in and reset out signals
— Seven sources of reset: