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Rev. 1.00, 05/04, page 84 of 544
Program excution state
Interrupt generated?
NMI
An interrupt with interrupt
control level 1?
IRQ0
IRQ1
IFBFI3
IRQ0
IRQ1
IFBFI3
UI = 0
Save PC and CCR
I 1, UI 1
Read vector address
Branch to interrupt handling routine
Yes
No
Yes
Yes
Yes
No
No
Yes
No
Yes No
Yes
Yes
No
No
Yes
Yes
No
Hold pending
I = 0
I = 0
Yes
Yes
No
No
Figure 5.6 Flowchart of Procedure Up to Interrupt Acceptance
in Interrupt Control Mode 1