Freescale Semiconductor, Inc.
GENERAL RELEASE SPECIFICATION
SECTION 8
TIMER
The timer consists of a 16-bit, software-programmable counter driven by a fixed
divide-by-four prescaler. This timer can be used for many purposes, including
input waveform measurements while simultaneously generating an output
waveform. Pulse widths can vary from several microseconds to many seconds.
Refer to Figure 8-1 for a timer block diagram.
Each specific functional segment (capability) is represented by two registers.
These registers contain the high and low byte of that functional segment.
Generally, accessing the low byte of a specific timer function allows full control of
that function; however, an access of the high byte inhibits that specific timer
function until the low byte also is accessed.
NOTE
The I bit in the CCR should be set while manipulating both the high
and low byte register of a specific timer function to ensure that an
interrupt does not occur.
TIMER
Rev. 2.0
8-1
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