H8S2245 datasheet(383/818 Pages) RENESAS

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Section 9 16-Bit Timer Pulse Unit (TPU)

Rev.3.00 Mar. 26, 2007 Page 341 of 772

REJ09B0355-0300

9.5

Interrupts

9.5.1

Interrupt Sources and Priorities

There are three kinds of TPU interrupt source: TGR input capture/compare match, TCNT

overflow, and TCNT underflow. Each interrupt source has its own status flag and enable/disabled

bit, allowing generation of interrupt request signals to be enabled or disabled individually.

When an interrupt request is generated, the corresponding status flag in TSR is set to 1. If the

corresponding enable/disable bit in TIER is set to 1 at this time, an interrupt is requested. The

interrupt request is cleared by clearing the status flag to 0.

Relative channel priorities can be changed by the interrupt controller, but the priority order within

a channel is fixed. For details, see section 5, Interrupt Controller.

Table 9.12 lists the TPU interrupt sources.

Table 9.12

TPU Interrupts

Channel

Interrupt

Source

Description

DTC

Activation

Priority

TGI0A

TGR0A input capture/compare match

Possible

High

TGI0B

TGR0B input capture/compare match

Possible

TGI0C

TGR0C input capture/compare match

Possible

TGI0D

TGR0D input capture/compare match

Possible

TCI0V

TCNT0 overflow

Not possible

TGI1A

TGR1A input capture/compare match

Possible

TGI1B

TGR1B input capture/compare match

Possible

TCI1V

TCNT1 overflow

Not possible

TCI1U

TCNT1 underflow

Not possible

TGI2A

TGR2A input capture/compare match

Possible

TGI2B

TGR2B input capture/compare match

Possible

TCI2V

TCNT2 overflow

Not possible

TCI2U

TCNT2 underflow

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.

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