MC68HC912DG128A MOTOROLA [Motorola, Inc], MC68HC912DG128A Datasheet - Page 196
MC68HC912DG128A
Manufacturer Part Number
MC68HC912DG128A
Description
microcontroller unit 16BIT DEVICE
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC912DG128A.pdf
(404 pages)
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Pulse
Accumulators
Pulse
Accumulator
latch mode
Pulse
Accumulator
queue mode
Modulus
Down-Counter
Enhanced Capture Timer
MC68HC912DT128A Rev 2.0
196
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.
At the same time the pulse accumulator is cleared.
The modulus down-counter can be used as a time base to generate a
periodic interrupt. It can also be used to latch the values of the IC
registers and the pulse accumulators to their holding registers.
The action of latching can be programmed to be periodic or only once.
Enhanced Capture Timer
MOTOROLA
10-ect
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