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• Parity, framing, and overrun error detection
• False-start bit detection
• Line-break detection and generation
• Detection of breaks originating in the middle of a character
• Start/end break interrupt/status
1.1.11 DMA Timers (DTIM0-DTIM3)
There are four independent, DMA-transfer-generating 32-bit timers (DTIM0, DTIM1,
DTIM2, DTIM3) on the MCF5282. Each timer module incorporates a 32-bit timer with a
separate register set for configuration and control. The timers can be configured to operate
from the system clock or from an external clock source using one of the DTINx signals. If
the system clock is selected, it can be divided by 16 or 1. The selected clock is further
divided by a user-programmable 8-bit prescaler which clocks the actual timer counter
register (TCRn). Each of these timers can be configured for input capture or reference
compare mode. By configuring the internal registers, each timer may be configured to
assert an external signal, generate an interrupt on a particular event, or cause a DMA
transfer.
1.1.12 General-Purpose Timers (GPTA/GPTB)
The two general-purpose timers (GPTA and GPTB) are 4-channel timer modules. Each
timer consists of a 16-bit programmable counter driven by a 7-stage programmable
prescaler. Each of the four channels for each timer can be configured for input capture or
output compare. Additionally, one of the channels, channel 3, can be configured as a pulse
accumulator.
A timer overflow function allows software to extend the timing capability of the system
beyond the 16-bit range of the counter. The input capture and output compare functions
allow simultaneous input waveform measurements and output waveform generation. The
input capture function can capture the time of a selected transition edge. The output
compare function can generate output waveforms and timer software delays. The 16-bit
pulse accumulator can operate as a simple event counter or a gated time accumulator.
1.1.13 Periodic Interrupt Timers (PIT0-PIT3)
The four periodic interrupt timers (PIT0, PIT1, PIT2, PIT3) are 16-bit timers that provide
precise interrupts at regular intervals with minimal processor intervention. Each timer can
either count down from the value written in its PIT modulus register, or it can be a
free-running down-counter.
MOTOROLA
Chapter 1. Overview
MCF5282 Key Features
1-13
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