H8S2426 Datasheet, PDF (825/1302 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family / H8S/2400 Series

Section 13 8-Bit Timers (TMR)
Section 13 8-Bit Timers (TMR)
This LSI has an on-chip 8-bit timer module with two channels operating on the basis of an 8-bit
counter. The 8-bit timer module can be used to count external events and be used as a
multifunction timer in a variety of applications, such as generation of counter reset, interrupt
requests, and pulse output with an arbitrary duty cycle using a compare-match signal with two
registers.
13.1 Features
• Selection of seven clock sources
The counters can be driven by one of six internal clock signals (φ/8, φ/64, φ/8192, φ/2, φ/32, or
φ/1024) or an external clock input
• Selection of three ways to clear the counters
The counters can be cleared on compare match A or B, or by an external reset signal
• Timer output control by a combination of two compare match signals
The timer output signal in each channel is controlled by a combination of two independent
compare match signals, enabling the timer to generate output waveforms with an arbitrary duty
cycle or PWM output
• Provision for cascading of two channels (TMR_0 and TMR_1)
Operation as a 16-bit timer is possible, using TMR_0 for the upper 8 bits and TMR_1 for the
lower 8 bits (16-bit count mode)
TMR_1 can be used to count TMR_0 compare matches (compare match count mode)
• Three independent interrupts
Compare match A and B and overflow interrupts can be requested independently
• A/D converter conversion start trigger can be generated
Figure 13.1 shows a block diagram of the 8-bit timer module (TMR_0 and TMR_1).
Rev. 1.00 Sep. 19, 2008 Page 797 of 1270
REJ09B0466-0100