Freescale Semiconductor, Inc.
Enhanced Capture Timer
Timer Registers
the main timer contents. At the next event the TCn data is transferred
to the TCnH register, The TCn is updated and the CnF interrupt flag
is set. See Figure 14-6.
In all other input capture cases the interrupt flag is set by a valid
external event on PTn.
0 = The timer flags C3F–C0F in TFLG1 ($8E) are set when a valid
input capture transition on the corresponding port pin occurs.
1 = If in queue mode (BUFEN=1 and LATQ=0), the timer flags
C3F–C0F in TFLG1 ($8E) are set only when a latch on the
corresponding holding register occurs.
If the queue mode is not engaged, the timer flags C3F–C0F are
set the same way as for TFMOD=0.
PACMX — 8-Bit Pulse Accumulators Maximum Count
0 = Normal operation. When the 8-bit pulse accumulator has
reached the value $FF, with the next active edge, it will be
incremented to $00.
1 = When the 8-bit pulse accumulator has reached the value $FF,
it will not be incremented further. The value $FF indicates a
count of 255 or more.
BUFEN — IC Buffer Enable
0 = Input Capture and pulse accumulator holding registers are
disabled.
1 = Input Capture and pulse accumulator holding registers are
enabled. The latching mode is defined by LATQ control bit.
Write one into ICLAT bit in MCCTL ($A6), when LATQ is set
will produce latching of input capture and pulse accumulators
registers into their holding registers.
LATQ — Input Control Latch or Queue Mode Enable
The BUFEN control bit should be set in order to enable the IC and
pulse accumulators holding registers. Otherwise LATQ latching
modes are disabled.
Write one into ICLAT bit in MCCTL ($A6), when LATQ and BUFEN
are set will produce latching of input capture and pulse accumulators
registers into their holding registers.
68HC(9)12D60 — Rev 4.0
MOTOROLA
Advance Information
Enhanced Capture Timer
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