R0K572011S000BE Renesas Electronics America, R0K572011S000BE Datasheet - Page 174

• Manufacturer Part Number: R0K572011S000BE
• Description: KIT STARTER FOR SH7201
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572011S000BE

• Contents: CPU Board, LCD Display Module, E8 Emulator, Cable, QuickStart Guide and CD-ROM
• For Use With/related Products: SH7201
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 6 Interrupt Controller (INTC)
6.6
6.6.1
The sequence of interrupt operations is described below. Figure 6.2 shows the operation flow.
1. The interrupt request sources send interrupt request signals to the interrupt controller.
2. The interrupt controller selects the highest-priority interrupt from the interrupt requests sent,
3. The priority level of the interrupt selected by the interrupt controller is compared with the
4. The CPU detects the interrupt request sent from the interrupt controller when the CPU decodes
5. The start address of the interrupt exception service routine is fetched from the exception
6. The status register (SR) is saved onto the stack, and the priority level of the accepted interrupt
7. The program counter (PC) is saved onto the stack.
8. The CPU jumps to the fetched start address of the interrupt exception service routine and starts
Notes: The interrupt source flag should be cleared in the interrupt handler. After clearing the
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following the priority levels set in interrupt priority registers 01, 02, and 05 to 16 (IPR01,
IPR02, and IPR05 to IPR16). Lower priority interrupts are ignored
have the same priority level or if multiple interrupts occur within a single IPR, the interrupt
with the highest priority is selected, according to the default priority and IPR setting unit
internal priority shown in table 6.4.
interrupt level mask bits (I3 to I0) in the status register (SR) of the CPU. If the interrupt
request priority level is equal to or less than the level set in bits I3 to I0, the interrupt request is
ignored. If the interrupt request priority level is higher than the level in bits I3 to I0, the
interrupt controller accepts the interrupt and sends an interrupt request signal to the CPU.
the instruction to be executed. Instead of executing the decoded instruction, the CPU starts
interrupt exception handling (figure 6.4).
handling vector table corresponding to the accepted interrupt.
is copied to bits I3 to I0 in SR.
executing the program. The jump that occurs is not a delayed branch.
* Interrupt requests that are designated as edge-sensing are held pending until the
interrupt source flag, "time from occurrence of interrupt request until interrupt controller
identifies priority, compares it with mask bits in SR, and sends interrupt request signal to
CPU" shown in table 6.5 is required before the interrupt source sent to the CPU is actually
cancelled. To ensure that an interrupt request that should have been cleared is not
inadvertently accepted again, read the interrupt source flag after it has been cleared, and
then execute an RTE instruction.
Operation
Interrupt Operation Sequence
interrupt requests are accepted. IRQ interrupts, however, can be cancelled by accessing
the IRQ interrupt request register (IRQRR). For details, see section 6.4.4, IRQ
Interrupts.
Interrupts held pending due to edge-sensing are cleared by a power-on reset or in deep
standby mode.
*
. If two of these interrupts
R01UH0026EJ0300 Rev. 3.00
SH7201 Group
Sep 24, 2010