SN8F2270B Series
USB 2.0 Low-Speed 8-Bit Micro-Controller
6
INTERRUPT
6.1 OVERVIEW
This MCU provides 7 interrupt sources, including 4 internal interrupt (T0/TC0/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
Q
INT0 Trigger
INT1 Trigger
Interrupt Vector Address (0008H)
INTR
Q
2-
P01IRQ
Interrupt
Global Interrupt Request
Signal
T0IRQ
T0 Time
Out
Enabl
e
Bit
TC0IRQ
TC0 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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