upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 359

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

12.7.2 Interrupt servicing
(n = 1 to 3).
Because clearing an interrupt source by the UF0ICn register is given a lower priority than setting an interrupt source
by hardware, the interrupt source may not be cleared depending on the timing (n = 0 to 4).
The following flowchart illustrates how an interrupt is serviced.
The following bits of the UF0ISn register are automatically cleared by hardware when a given condition is satisfied
• E0INDT, E0ODT, SUCES, STG, and CPUDEC bits of UF0IS1 register
• BKI1DT bit of UF0IS2 register
• BKO1FL and BKO1DT bits of UF0IS3 register
Remark
♦: Processing by hardware
Reading UF0IS4 register
SETINTC of UF0IC4
Servicing interrupt
INTUSBaB active
INTUSB2B = 0?
register = 0
START
END
Yes
CHAPTER 12 USB FUNCTION CONTROLLER (USBF)
(a = 0 to 2)
Figure 12-13. Interrupt Servicing
Preliminary User’s Manual U19014EJ1V0UD
No
Reading UF0ISn register
Target bit of UF0ICn
INTUSB0B = 0?
register = 0
Yes
(n = 0, 1)
Masking ID bit
No
Reading UF0ISm register
Target bit of UF0ICm
register = 0
(m = 2, 3)
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