HD6475328CG Datasheet, PDF (223/459 Pages) Hitachi Semiconductor – Manual Gives a Hardware Description

Section 11 8-Bit Timer
11.1 Overview
The H8/532 chip includes a single 8-bit timer based on an 8-bit counter (TCNT). The timer has
two time constant registers (TCORA and TCORB) that are constantly compared with the TCNT
value to detect compare-match events. One application of the 8-bit timer is to generate a
rectangular-wave output with an arbitrary duty factor.
11.1.1 Features
The features of the 8-bit timer are listed below.
• Selection of four clock sources
The counter can be driven by an internal clock signal (ø/8, ø/64, or ø/1024) or an external clock
input (enabling use as an external event counter).
• Selection of three ways to clear the counter
The counter can be cleared on compare-match A or B, or by an external reset signal.
• Timer output controlled by two time constants
The single timer output (TMO) is controlled by two independent time constants, enabling the
timer to generate output waveforms with an arbitrary duty factor.
• Three types of interrupts
Compare-match A and B and overflow interrupts can be requested independently.
The compare match interrupts can be served by the data transfer controller (DTC), enabling
interrupt-driven data transfer with minimal CPU programming.
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