Motorola ColdFire MCF5281 - Manual (Page 36)

Overview
1-4 Freescale Semiconductor
— Toggle-on-overflow feature for pulse-width modulator (PWM) generation
— One dual-mode pulse accumulation channel per timer
• Four periodic interrupt timers (PITs)
— 16-bit counter
— Selectable as free running or count down
• Software watchdog timer
— 16-bit counter
— Low-power mode support
• Phase locked loop (PLL)
— Crystal or external oscillator reference
— 2- to 10-MHz reference frequency for normal PLL mode
— 33- to 80-MHz (66 MHz for MCF5214/16) oscillator reference frequency for 1:1 mode
— Low-power modes supported
— Separate clock output pin
• Two interrupt controllers
— Support for up to 63 interrupt sources per interrupt controller (a total of 126), organized as
follows:
– 56 fully-programmable interrupt sources
– 7 fixed-level interrupt sources
— Seven external interrupt signals
— 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 x 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 connections between the 11 DMA requesters in the UARTs (3), 32-bit
timers (4) plus external logic (4) and the four DMA channels
• External bus interface
— Glueless connections to external memory devices (e.g., SRAM, Flash, ROM, etc.)
— SDRAM controller supports 8-, 16-, and 32-bit wide memory devices
— Glueless interface to SRAM devices with or without byte strobe inputs
— Programmable wait state generator
— 32-bit bidirectional data bus
— 24-bit address bus
— Up to seven chip selects available
— Byte/write enables (byte strobes)
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3