M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 100
M30280F6HP
Manufacturer Part Number
M30280F6HP
Description
16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.M30280F6HP.pdf
(423 pages)
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9.5 Interrupt Priority
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Figure 9.9 Hardware Interrupt Priority
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9.4.4 Returning from an Interrupt Routine
If two or more interrupt requests are generated while executing one instruction, the interrupt request that
has the highest priority is accepted.
For maskable interrupts (peripheral functions), any desired priority level can be selected using the ILVL2 to
ILVL0 bits. However, if two or more maskable interrupts have the same priority level, their interrupt priority
is resolved by hardware, with the highest priority interrupt accepted.
The watchdog timer and other special interrupts have their priority levels set in hardware. Figure 9.9 shows
the priorities of hardware interrupts.
Software interrupts are not affected by the interrupt priority. If an instruction is executed, control branches
invariably to the interrupt routine.
C
9.5.1 Interrupt Priority Resolution Circuit
2
9
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The FLG register and PC in the state in which they were immediately before entering the interrupt se-
quence are restored from the stack by executing the REIT instruction at the end of the interrupt routine.
Thereafter the CPU returns to the program which was being executed before accepting the interrupt
request.
Return the other registers saved by a program within the interrupt routine using the POPM or similar
instruction before executing the REIT instruction.
0 .
B
The interrupt priority resolution circuit is used to select the interrupt with the highest priority among those
requested.
Figure 9.10 shows the circuit that judges the interrupt priority level.
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page 80
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Watchdog timer, oscillation stop
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and re-oscillation detection,
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low voltage detection
Peripheral function
Address match
Single step
Reset
DBC
NMI
High
Low
9. Interrupts
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