HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 115

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

4.3
Interrupt exception handling can be requested by seven external sources (NMI, IRQ
27 internal sources in the on-chip supporting modules. Figure 4.4 classifies the interrupt sources
and indicates the number of interrupts of each type.
The on-chip supporting modules that can request interrupts are the watchdog timer (WDT), 16-bit
timer, 8-bit timer, serial communication interface (SCI), and A/D converter. Each interrupt source
has a separate vector address.
NMI is the highest-priority interrupt and is always accepted. Interrupts are controlled by the
interrupt controller. The interrupt controller can assign interrupts other than NMI to two priority
levels, and arbitrate between simultaneous interrupts. Interrupt priorities are assigned in interrupt
priority registers A and B (IPRA and IPRB) in the interrupt controller.
For details on interrupts see section 5, Interrupt Controller.
4.4
Trap instruction exception handling starts when a TRAPA instruction is executed. If the UE bit is
set to 1 in the system control register (SYSCR), the exception handling sequence sets the I bit to 1
in CCR. If the UE bit is 0, the I and UI bits are both set to 1 in CCR. The TRAPA instruction
fetches a start address from a vector table entry corresponding to a vector number from 0 to 3,
which is specified in the instruction code.
Notes: Numbers in parentheses are the number of interrupt sources.
Interrupts
Trap Instruction
* When the watchdog timer is used as an interval timer, it generates an interrupt
Interrupts
request at every counter overflow.
Figure 4.4 Interrupt Sources and Number of Interrupts
External interrupts
Internal interrupts
NMI (1)
IRQ to IRQ (6)
WDT
16-bit timer (9)
8-bit timer (8)
SCI (8)
A/D converter (1)
0
*
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5
4. Exception Handling
REJ09B0395-0400
0
to IRQ
5
), and