r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 126
r5s72060w200fpv
Manufacturer Part Number
r5s72060w200fpv
Description
32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S72060W200FPV.pdf
(1180 pages)
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Section 4 Exception Handling
4.5.3
Interrupt Exception Handling
When an interrupt occurs, its priority level is ascertained by the interrupt controller (INTC). NMI
is always accepted, but other interrupts are only accepted if they have a priority level higher than
the priority level set in the interrupt mask level bits (I3 to I0) of the status register (SR).
When an interrupt is accepted, interrupt exception handling begins. In interrupt exception
handling, the CPU fetches the exception service routine start address which corresponds to the
accepted interrupt from the exception handling vector table, and saves SR and the program counter
(PC) to the stack. In the case of interrupt exception handling other than NMI or user breaks with
usage of the register banks enabled, general registers R0 to R14, control register GBR, system
registers MACH, MACL, and PR, and the vector table address offset of the interrupt exception
handling to be executed are saved in the register banks. In the case of exception handling due to an
address error, NMI interrupt, user break interrupt, or instruction, saving is not performed to the
register banks. If saving has been performed to all register banks (0 to 14), automatic saving to the
stack is performed instead of register bank saving. In this case, an interrupt controller setting must
have been made so that register bank overflow exceptions are not accepted (the BOVE bit in
IBNR of the INTC is 0). If a setting to accept register bank overflow exceptions has been made
(the BOVE bit in IBNR of the INTC is 1), register bank overflow exception occurs. Next, the
priority level value of the accepted interrupt is written to the I3 to I0 bits in SR. For NMI,
however, the priority level is 16, but the value set in the I3 to I0 bits is H'F (level 15). Then, after
jumping to the start address fetched from the exception handling vector table, program execution
starts. The jump that occurs is not a delayed branch. See section 5.6, Operation, for further details
of interrupt exception handling.
Rev. 2.00 Dec. 09, 2005 Page 102 of 1152
REJ09B0191-0200
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