HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 229

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

11.1 Overview
The H8/534 and H8/536 have 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
• Selection of three ways to clear the counter
• Timer output controlled by two time constants
• Three types of interrupts
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).
The counter can be cleared on compare-match A or B, or by an external reset signal.
The single timer output (TMO) is controlled by two independent time constants, enabling the
timer to generate output waveforms with an arbitrary duty factor.
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.
Section 11 8-Bit Timer
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