AT89C5122DS-RDRUM datasheet(113/208 Pages) ATMEL

113 / 208 page

113

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

USB Interrupt System

Interrupt System Priorities

Figure 62.

USB Interrupt Control System

Interrupt Control System

As shown in Figure 63, many events can produce a USB interrupt:

•

TXCMPL: Transmitted In Data (Table 70 on page 119). This bit is set by hardware

when the Host accept a In packet.

•

RXOUTB0: Received Out Data Bank 0 (Table 70 on page 119). This bit is set by

hardware when an Out packet is accepted by the endpoint and stored in bank 0.

•

RXOUTB1: Received Out Data Bank 1 (only for Ping-Pong endpoints) (Table 70 on

page 119). This bit is set by hardware when an Out packet is accepted by the

endpoint and stored in bank 1.

•

RXSETUP: Received Setup (Table 70 on page 119). This bit is set by hardware

when an SETUP packet is accepted by the endpoint.

•

NAKIN and NAKOUT: These bits are set by hardware when a Nak Handshake has

been received on the corresponding endpoint. These bits are cleared by software.

•

STLCRC: STALLED (only for Control, Bulk and Interrupt endpoints) (Table on page

120). This bit is set by hardware when a STALL handshake has been sent as

requested by STALLRQ, and is reset by hardware when a SETUP packet is

received.

•

SOFINT: Start Of Frame Interrupt (Table 65 on page 116). This bit is set by

hardware when a USB start of frame packet has been received.

•

WUPCPU: Wake-Up CPU Interrupt (Table 65 on page 116). This bit is set by

hardware when a USB resume is detected on the USB bus, after a SUSPEND state.

•

SPINT: Suspend Interrupt (Table 65 on page 116). This bit is set by hardware when

a USB suspend is detected on the USB bus.

EUSB

IEN1.6

IEN0.7

USB

Controller

IPH/L

Interrupt Enable

Lowest Priority Interrupts

Priority Enable

D+

D-

Table 63.

Priority Levels

IPHUSB

IPLUSB

USB Priority Level

0 Lowest

3 Highest

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