When Interrupt Servicing Occurs Twice During Dma Operation - NEC V850/SB1 User Manual

Figure 12-8. When Interrupt Servicing Occurs Twice During DMA Operation (1/2)
Interrupt request
(b) Interrupt servicing when interrupt servicing occurs twice
Since the interrupt request flag
(xxIFn) remains 1, the interrupt
Remark xx: Identification name of each peripheral unit (see Table 5-2)
n: Peripheral unit number (see Table 5-2)
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CHAPTER 12
(a) Normal interrupt servicing
Main routine
EI
Main routine
EI
Bit manipulation
instruction to xxIFn
Interrupt request
is serviced again.
User's Manual U13850EJ6V0UD
DMA FUNCTIONS
Interrupt servicing routine
Interrupt request flag (xxIFn) is
cleared (0).
RETI
Interrupt servicing routine
Interrupt request flag (xxIFn) is
not cleared and remains 1.
RETI
Interrupt request flag (xxIFn) is
cleared (0).
RETI