HD64F2145 datasheet(307/829 Pages) RENESAS

307 / 829 page

Rev. 2.0, 08/02, page 267 of 788

Section 12 8-Bit Timer (TMR)

This LSI has an on-chip 8-bit timer module (TMR_0 and TMR_1) with two channels operating on

the basis of an 8-bit counter. The 8-bit timer module can count external events, and can also 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.

This LSI also has a similar on-chip 8-bit timer module (TMR_Y and TMR_X) with two channels,

which can be used through connection to the timer connection.

12.1

Features

• Selection of clock sources

 TMR_0, TMR_1: The counter input clock can be selected from six internal clocks and an

external clock

 TMR_Y, TMR_X: The counter input clock can be selected from three internal clocks and

an external clock

• Selection of three ways to clear the counters

 The counters can be cleared on compare-match A or compare-match B, or by an external

reset signal.

• Timer output controlled by two compare-match signals

 The timer output signal in each channel is controlled by two independent compare-match

signals, enabling the timer to be used for various applications, such as the generation of

pulse output or PWM output with an arbitrary duty cycle. (The TMR_Y does not have a

timer output pin.)

• Cascading of TMR_0 and TMR_1

 (TMR_Y and TMR_X cannot be cascaded.)

Operation as a 16-bit timer can be performed using TMR_0 as the upper half and TMR_1

as the lower half (16-bit count mode).

TMR_1 can be used to count TMR_0 compare-match occurrences (compare-match count

mode).

• Multiple interrupt sources for each channel

 TMR_0, TMR_1, and TMR_Y: Three types of interrupts: Compare-match A, compare-

match B, and overflow

 TMR_X: Input capture

TIMH261A_010020020700

HD64F2145 Datasheet(PDF) 307 Page - Renesas Technology Corp