
PSD5XX Famly
102
Figure 48. Interrupt Flowchart
CONFIGURE
INTERRUPT
SOURCE PLD
AND / OR
TIMER COUNT
i.e. UNMASK
REQD INTRPT
INTERRUPT
OCCURRED
DETERMINE
PRIORITY
OF THE
INTERRUPT
KEEP LOW
PRIORITY
INTERRUPTS
PENDING
SERVICE
HIGH PRIORITY
INTERRUPT
ARE
ALL
INTERRUPTS
SERVICED
CONTINUE
EXECUTING
MAIN LOOP
UNTIL INTERRUPT
OCCURS
INTERRUPT
INITIALIZATION
CLEAR ALL
PENDING BITS
(READ CLEAR
REGISTER
DEFINE EDGE
OR LEVEL
SENSITIVE
NO
YES
NO
YES
Interrupt
Controller
(Cont.)