MC68HC912D60 Motorola, MC68HC912D60 Datasheet - Page 232
MC68HC912D60
Manufacturer Part Number
MC68HC912D60
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC68HC912D60.pdf
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Enhanced Capture Timer
14.3.2 Pulse Accumulators
14.3.2.1 Pulse Accumulator latch mode
14.3.2.2 Pulse Accumulator queue mode
Technical Data
232
If the corresponding NOVWx bit of the ICOVW register is cleared, with a
new occurrence of a capture, the value of the IC register will be
transferred to its holding register and the IC register memorizes the new
timer value.
If the corresponding NOVWx bit of the ICOVW register is set, the capture
register or its holding register cannot be written by an event unless they
are empty (see
In queue mode, reads of holding register will latch the corresponding
pulse accumulator value to its holding register.
There are four 8-bit pulse accumulators with four 8-bit holding registers
associated with the four IC buffered channels. A pulse accumulator
counts the number of active edges at the input of its channel.
The user can prevent 8-bit pulse accumulators counting further than $FF
by PACMX control bit in ICSYS ($AB). In this case a value of $FF means
that 255 counts or more have occurred.
Each pair of pulse accumulators can be used as a 16-bit pulse
accumulator.
There are two modes of operation for the pulse accumulators.
The value of the pulse accumulator is transferred to its holding register
when the modulus down-counter reaches zero, a write $0000 to the
modulus counter or when the force latch control bit ICLAT is written.
At the same time the pulse accumulator is cleared.
When queue mode is enabled, reads of an input capture holding register
will transfer the contents of the associated pulse accumulator to its
holding register.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Enhanced Capture Timer
IC
Channels).
MC68HC912D60A — Rev 3.0
MOTOROLA
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