HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 200
HD6435348R
Manufacturer Part Number
HD6435348R
Description
Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6435348R.pdf
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10.1 Overview
The H8/534 and H8/536 have an on-chip 16-bit free-running timer (FRT) module with three
independent channels (FRT1, FRT2, and FRT3). All three channels are functionally identical.
Each channel has a 16-bit free-running counter that it uses as a time base. Applications of the
FRT module include rectangular-wave output (up to two independent waveforms per channel),
input pulse width measurement, and measurement of external clock periods.
10.1.1 Features
The features of the free-running timer module are listed below.
• Selection of four clock sources
• Two independent comparators
• Input capture function
• Four types of interrupts
• Counter can be cleared under program control
The free-running counters can be driven by an internal clock source (ø/4, ø/8, or ø/32), or an
external clock input (enabling use as an external event counter).
Each free-running timer channel can generate two independent waveforms.
The current count can be captured on the rising or falling edge (selectable) of an input signal.
Compare-match A and B, input capture, and overflow interrupts can be requested
independently.
The compare-match and input capture interrupts can be served by the data transfer controller
(DTC), enabling interrupt-driven data transfer with minimal CPU programming.
The free-running counters can be cleared on compare-match A.
Section 10 16-Bit Free-Running Timers
183
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