H8SLASH3028F datasheet(429/923 Pages) RENESAS

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Rev. 2.00, 09/03, page 399 of 890

10.5

Interrupt

10.5.1

Interrupt Sources

The 8-bit timer unit can generate three types of interrupt: compare match A and B (CMIA and

CMIB) and overflow (TOVI). Table 10.5 shows the interrupt sources and their priority order.

Each interrupt source is enabled or disabled by the corresponding interrupt enable bit in 8TCR. A

separate interrupt request signal is sent to the interrupt controller by each interrupt source.

Table 10.5 Types of 8-Bit Timer Interrupt Sources and Priority Order

Interrupt Source

Description

Priority

CMIA

Interrupt by CMFA

High

CMIB

Interrupt by CMFB

TOVI

Interrupt by OVF

Low

For compare match interrupts CMIA1/CMIB1 and CMIA3/CMIB3 and the overflow interrupts

(TOVI0/TOVI1 and TOVI2/TOVI3), one vector is shared by two interrupts.

Table 10.6 lists the interrupt sources.

Table 10.6 8-Bit Timer Interrupt Sources

Channel

Interrupt Source

Description

CMIA0

TCORA0 compare match

CMIB0

TCORB0 compare match/input capture

CMIA1/CMIB1

TCORA1 compare match, or TCORB1 compare match/input

capture

0, 1

TOVI0/TOVI1

Counter 0 or counter 1 overflow

CMIA2

TCORA2 compare match

CMIB2

TCORB2 compare match/input capture

CMIA3/CMIB3

TCORA3 compare match, or TCORB3 compare match/input

capture

2, 3

TOVI2/TOVI3

Counter 2 or counter 3 overflow

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