H8S2245 datasheet(421/818 Pages) RENESAS

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Section 10 8-Bit Timers

Rev.3.00 Mar. 26, 2007 Page 379 of 772

REJ09B0355-0300

Note on Usage

If the 16-bit counter mode and compare match counter mode are set simultaneously, the input

clock pulses for TCNT0 and TCNT1 are not generated and thus the counters will stop operating.

Software should therefore avoid using both these modes.

10.4

Interrupt Sources

10.4.1

Interrupt Sources and DTC Activation

There are three 8-bit timer interrupt sources: CMIA, CMIB, and OVI. Their relative priorities are

shown in table 10.3. Each interrupt source is set as enabled or disabled by the corresponding

interrupt enable bit in TCR, and independent interrupt requests are sent for each to the interrupt

controller. It is also possible to activate the DTC by means of CMIA and CMIB interrupts.

Table 10.3

8-Bit Timer Interrupt Sources

Channel

Interrupt Source

Description

DTC Activation

Priority

CMIA0

Interrupt by CMFA

Possible

High

CMIB0

Interrupt by CMFB

Possible

OVI0

Interrupt by OVF

Not possible

CMIA1

Interrupt by CMFA

Possible

CMIB1

Interrupt by CMFB

Possible

OVI1

Interrupt by OVF

Not possible

Low

Note:

This table shows the initial state immediately after a reset. The relative channel priorities

can be changed by the interrupt controller.

10.4.2

A/D Converter Activation

The A/D converter can be activated only by channel 0 compare match A.

If the ADTE bit in TCSR0 is set to 1 when the CMFA flag is set to 1 by the occurrence of channel

0 compare match A, a request to start A/D conversion is sent to the A/D converter. If the 8-bit

timer conversion start trigger has been selected on the A/D converter side at this time, A/D

conversion is started.

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