HD64F2168 Datasheet, PDF (345/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

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 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.
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, 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.
• Cascading of TMR_0 and TMR_1
(Cascading of TMR_Y and TMR_X is not allowed)
 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:
Four types of interrupts: Compare-match A, compare-
match B, overflow, and input capture
Figures 12.1 and 12.2 show block diagrams of 8-bit timers.
An input capture function is added to TMR_X.
TIMH261A_000120020900
Rev. 3.00, 03/04, page 305 of 830