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Section 15 Timer L
15.1
Overview
The Timer L is an 8-bit up/down counter using the control pulses or the CFG division signals as
the clock source.
15.1.1
Features
Features of the Timer L are as follows:
•
Choices of two different types of internal clocks (
φ
/128 and
φ
/64), DVCFG2 (CFG division
signal 2), PB and REC-CTL (control pulses) are available for your selection.
—
In case the PB-CTL is not available, such as when reproducing un-recorded tapes, tape
count can be made by the DVCFG2.
—
Selection of the leading edge or the trailing edge is workable with the CTL pulse
counting.
•
Interrupts occur when the counter overflows or underflows and at occurrences of compare
match clear.
•
It is possible to switch over between the up-counting and down-counting functions with the
counter.
Summary of Contents for Hitachi H8S/2191
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