h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 367

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

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,
which can be used through connection to the timer connection.
13.1
Figures 13.1 and 13.2 show block diagrams of 8-bit timers.
TIMH261A_000020020300
Selection of clock sources
TMR_0, TMR_1: The counter input clock can be selected from six internal clocks and an
TMR_Y, TMR_X: The counter input clock can be selected from three internal clocks and
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.
Cascading of two channels
Multiple interrupt sources for each channel
TMR_0, TMR_1, and TMR_Y: Three types of interrupts: Compare-match A, compare-
TMR_X:
Cascading of TMR_0 and TMR_1
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).
Features
Section 13 8-Bit Timer (TMR)
external clock
an external clock
match B, and overflow
Four types of interrupts: Compare-match A, compare-
match B, overflow, and input capture
Rev. 3.00 Jan 25, 2006 page 315 of 872
Section 13 8-Bit Timer (TMR)
REJ09B0286-0300