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AT89C5131-RDTIL Datasheet(PDF) 135 Page - ATMEL Corporation |
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AT89C5131-RDTIL Datasheet(HTML) 135 Page - ATMEL Corporation |
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135 / 176 page  135 AT89C5131 4136B–USB–09/03 Table 91. USBINT Register USBINT (S:BDh) USB Global Interrupt Register Reset Value = 00h 765 43210 - - WUPCPU EORINT SOFINT - - SPINT Bit Number Bit Mnemonic Description 7-6 - Reserved The value read from these bits is always 0. Do not set these bits. 5 WUPCPU Wake Up CPU Interrupt This bit is set by hardware when the USB controller is in SUSPEND state and is re-activated by a non-idle signal FROM USB line (not by an upstream resume). This triggers a USB interrupt when EWUPCPU is set in Figure 92 on page 136. When receiving this interrupt, user has to enable all USB clock inputs. This bit will be cleared by software (USB clocks must be enabled before). 4EORINT End Of Reset Interrupt This bit is set by hardware when a End Of Reset has been detected by the USB controller. This triggers a USB interrupt when EEORINT is set in the Figure 92 (see Figure 92 on page 136). This bit will be cleared by software. 3SOFINT Start of Frame Interrupt This bit is set by hardware when an USB Start of Frame PID (SOF) has been detected. This triggers a USB interrupt when ESOFINT is set in the Figure 92 (see Figure 92 on page 136). This bit will be cleared by software. 2- Reserved The value read from this bit is always 0. Do not set this bit. 1- Reserved The value read from this bit is always 0. Do not set this bit. 0SPINT Suspend Interrupt This bit is set by hardware when a USB Suspend (Idle bus for three frame periods: a J state for 3 ms) is detected. This triggers a USB interrupt when ESPINT is set in see Figure 92 on page 136. This bit will be cleared by software BEFORE any other USB operation to re- activate the macro. |
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