r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 163

• Manufacturer Part Number: r5s72060w200fpv
• Description: 32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
• Manufacturer: Renesas Electronics Corporation.

5.6
5.6.1
The sequence of interrupt operations is described below. Figure 5.2 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. When the interrupt controller accepts an interrupt, a low level is output from the IRQOUT pin.
5. The CPU detects the interrupt request sent from the interrupt controller when the CPU decodes
6. The interrupt exception service routine start address is fetched from the exception handling
7. The status register (SR) is saved onto the stack, and the priority level of the accepted interrupt
8. The program counter (PC) is saved onto the stack.
9. The CPU jumps to the fetched interrupt exception service routine start address and starts
10. A high level is output from the IRQOUT pin. However, if the interrupt controller accepts an
following the priority levels set in interrupt priority registers 01, 02, and 05 to 14 (IPR01,
IPR02, and IPR05 to IPR14). Lower priority interrupts are ignored*. If two of these interrupts
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 5.4.
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 5.4).
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 with a higher priority than the interrupt just being accepted, the IRQOUT pin holds
low level.
Operation
Interrupt Operation Sequence
Rev. 2.00 Dec. 09, 2005 Page 139 of 1152
Section 5 Interrupt Controller (INTC)
REJ09B0191-0200