SN8F2250B Series
USB 2.0 Full-Speed 8-Bit Micro-Controller
6.13 SIO INTERRUPT OPERATION
When the SIO converting successfully, the SIOIRQ will be set to “1” no matter the SIOIEN is enable or disable. If the
SIOIEN and the trigger event SIOIRQ is set to be “1”. As the result, the system will execute the interrupt vector. If the
SIOIEN = 0, the trigger event SIOIRQ is still set to be “1”. Moreover, the system won’t execute interrupt vector even
when the SIOIEN is set to be “1”. Users need to be cautious with the operation under multi-interrupt situation.
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Example: SIO interrupt request setup.
B0BSET
B0BCLR
B0BSET
FSIOIEN
FSIOIRQ
FGIE
; Enable SIO interrupt service
; Clear SIO interrupt request flag
; Enable GIE
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Example: SIO interrupt service routine.
ORG
JMP
8
; Interrupt vector
INT_SERVICE
INT_SERVICE:
…
; Push routine to save ACC and PFLAG to buffers.
B0BTS1
JMP
FSIOIRQ
EXIT_INT
; Check SIOIRQ
; SIOIRQ = 0, exit interrupt vector
B0BCLR
FSIOIRQ
; Reset SIOIRQ
…
; SIO interrupt service routine
…
EXIT_INT:
…
; Pop routine to load ACC and PFLAG from buffers.
; Exit interrupt vector
RETI
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