SN8F2250B Series
USB 2.0 Full-Speed 8-Bit Micro-Controller
6
INTERRUPT
6.1 OVERVIEW
This MCU provides 9 interrupt sources, including 6 internal interrupt (T0/T1/TC0/TC1/USB/SIO) and two external
interrupt (INT0/INT1). The external interrupt can wakeup the chip while the system is switched from power down mode
to high-speed normal mode. Once interrupt service is executed, the GIE bit in STKP register will clear to “0” for
stopping other interrupt request. On the contrast, when interrupt service exits, the GIE bit will set to “1” to accept the
next interrupts’ request. All of the interrupt request signals are stored in INTRQ register.
INTEN Interrupt Enable
Register
P00IR
INT0 Trigger
INT1 Trigger
Q
P01IR
Q
Interrupt Vector Address (0008H)
T0IRQ
T0 Time
Out
T1 Time
Out
INTR
Q
2-
Interrupt
Global Interrupt Request
Signal
T1IRQ
Enabl
e
Bit
TC0IRQ
TC1IRQ
TC0 Time Out
TC1 Time Out
Latchs
Gating
USBIR
Q
USB Process
End
SIOIRQ
SIO Transmit ready
I/O pin wakeup
trigger
WAKEIR
Q
Note: The GIE bit must enable during all interrupt operation.
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