HD6413308 Hitachi Semiconductor, HD6413308 Datasheet - Page 138

• Manufacturer Part Number: HD6413308
• Description: Hitachi Single-Chip MicroComputer
• Manufacturer: Hitachi Semiconductor

6.1 Overview
The H8/330 has an on-chip 16-bit free-running timer (FRT) module that uses a 16-bit free-running
counter as a time base. Applications of the FRT module include rectangular-wave output (up to
two independent waveforms), input pulse width measurement, and measurement of external clock
periods.
6.1.1 Features
The features of the free-running timer module are listed below.
• Selection of four clock sources
• Two independent comparators
• Four input capture channels
• Counter can be cleared under program control
• Seven independent interrupts
6.1.2 Block Diagram
Figure 6-1 shows a block diagram of the free-running timer.
The free-running counter can be driven by an internal clock source (Ø/2, Ø/8, or Ø/32), or an
external clock input (enabling use as an external event counter).
Each comparator can generate an independent waveform.
The current count can be captured on the rising or falling edge (selectable) of an input signal.
The four input capture registers can be used separately, or in a buffer mode.
The free-running counters can be cleared on compare-match A.
Compare-match A and B, input capture A to D, and overflow interrupts are requested
independently.
Section 6. 16-Bit Free-Running Timer
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