Interrupt Flow - Fujitsu MB96300 series Hardware Manual

MB96300 Super Series Hardware Manual
3.5

Interrupt Flow

Figure 3.5-2 "Interrupt flow" shows the interrupt flow.
■ Interrupt flow
The interrupt processing flow is entered at occurrence of hardware interrupts, software interrupts or
exceptions. For a detailed interrupt flow chart see Figure 3.5-2 "Interrupt flow".
The CPU special registers are saved on the stack before the interrupt is processed (see Figure 3.5-1 "Register
saving during interrupt processing").
MSB
H
L
At the end of the interrupt processing, the context of the CPU registers is restored while executing the RETI
instruction. The CPU returns to normal program execution.
Figure 3.5-1 Register saving during interrupt processing
Word (16 bits)
AH
AL
DPR
DTB
PC
PS
LSB
SSP (value before interrupt)
ADB SSP
PCB
SSP (value after interrupt)
CHAPTER 3 INTERRUPTS
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