HD6433308 Datasheet, PDF (78/349 Pages) Hitachi Semiconductor – Hitachi Single-Chip MicroComputer

4.2 Interrupts
There are nine input pins for external interrupts (NMI, IRQ0 to IRQ7). There are also 19 internal
interrupts originating in the 16-bit free-running timer (FRT), 8-bit timers (TMR0 and TMR1), serial
communication interface (SCI), and A/D converter. The features of these interrupts are:
• All internal and external interrupts except NMI can be masked by the I bit in the CCR.
• IRQ0 to IRQ7 can be edge-sensed or level-sensed. (The falling edge or Low level is active.)
The type of sensing can be selected for each interrupt individually. NMI is edge-sensed, and
either the rising or falling edge can be selected.
• Interrupts are individually vectored. The software interrupt-handling routine does not have to
determine what type of interrupt has occurred.
Table 4-2 lists all the interrupts in their order of priority and gives their vector numbers and the
addresses of their entries in the vector table.
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