Fujitsu MB91150 Series Hardware Manual page 288

CHAPTER 12 INTERRUPT CONTROLLER
I Hold-request cancellation-request sequence
❍ Example for the interrupt routine
Figure 12.7-2 "Sample timing chart of the hold request cancellation-request sequence (Interrupt
level is HRCL > a)" is a sample timing chart of the hold request cancellation-request sequence
(interrupt level HRCL > a).
Figure 12.7-2 Sample timing chart of the hold request cancellation-request sequence
CPU
DHRQ
HRQ
HACK
IRQ
LEVEL
HRCR
PDRR
272
(Interrupt level is HRCL > a)
RUN Bus hold
(1)(2)
a
0000
Interrupt handling Bus hold (DMA transfer)
(3) (4)
0001 0000