Interrupt; Interrupt Source - Hitachi H8/3006 Hardware Manual

10.5

Interrupt

10.5.1

Interrupt Source

The 8-bit timer unit can generate three types of interrupt: compare match A and B (CMIA and
CMIB) and overflow (OVI). Table 10.3 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 10.3 Types of 8-Bit Timer Interrupt Sources and Priority Order
Interrupt Source
CMIA
CMIB
TOVI
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 10.4 lists the interrupt sources.
Table 10.4 8-Bit Timer Interrupt Sources
Channel Interrupt Source
0 CMIA0
CMIB0
1 CMIA1/CMIB1
0, 1 TOVI0/TOVI1
2 CMIA2
CMIB2
3 CMIA3/CMIB3
2, 3 TOVI2/TOVI3
Description
Interrupt by CMFA
Interrupt by CMFB
Interrupt by OVF
Description
TCORA0 compare match
TCORB0 compare match/input capture
TCORA1 compare match, or TCORB1 compare match/input
capture
Counter 0 or counter 1 overflow
TCORA2 compare match
TCORB2 compare match/input capture
TCORA3 compare match, or TCORB3 compare match/input
capture
Counter 2 or counter 3 overflow
Priority
High
Low
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