c51的中断入口问题，请高手看过来

我看了一些ＣＹＰＲＥＳＳ的ＦＩＲＭＷＡＲＥ程序，看到有如下程序，每个中断函数都是 Interrup 0，能行吗？

请高手指点，急急

/-----------------------------------------------------------------------------
// USB Interrupt Handlers
// The following functions are called by the USB interrupt jump table.
//-----------------------------------------------------------------------------

// Setup Data Available Interrupt Handler
void ISR_Sudav(void) interrupt 0
{
GotSUD = TRUE; // Set flag
EZUSB_IRQ_CLEAR();
USBIRQ = bmSUDAV; // Clear SUDAV IRQ
}

// Setup Token Interrupt Handler
void ISR_Sutok(void) interrupt 0
{
EZUSB_IRQ_CLEAR();
USBIRQ = bmSUTOK; // Clear SUTOK IRQ
}

void ISR_Sof(void) interrupt 0
{
EZUSB_IRQ_CLEAR();
USBIRQ = bmSOF; // Clear SOF IRQ
}

void ISR_Ures(void) interrupt 0
{
EZUSB_IRQ_CLEAR();
USBIRQ = bmURES; // Clear URES IRQ
}

和如下的EZ-USB chip资料对不上呀，所有中断不是ＩＮＴ２吗，到底是怎么会事，请大虾给予指点呀．是越看越糊涂呀，是ＣＹＰＲＥＳＳ给的资料不全么？


All standard 8051 interrupts are supported in the enhanced 8051 core. Table 2-1 shows the existing
and added 8051 interrupts, and indicates how the added ones are used.
The EZ-USB chip uses 8051 INT2 for 21 different USB interrupts: 16 bulk endpoints plus SOF,
Suspend, SETUP Data, SETUP Token, and USB Bus Reset. To help the 8051 determine which
interrupt is active, the EZ-USB core provides a feature called Autovectoring. The core inserts an
address byte into the low byte of the 3-byte jump instruction found at the 8051 INT2 vector
address. This second level of vectoring automatically transfers control to the appropriate USB
ISR. The Autovector mechanism, as well as the EZ-USB interrupt system is the subject of Chapter
9, "EZ-USB Interrupts."
Table 2-1. EZ-USB Interrupts
Standard 8051
Interrupts
Enhanced 8051
Interrupts Used As
INT0 Device Pin INT0#
INT1 Device Pin INT1#
Timer 0 Internal, Timer 0
Timer 1 Internal, Timer 1
Tx0 & Rx0 Internal, UART0
INT2 Internal, USB
INT3 Internal, I2C Controller
INT4 Device Pin, PB4/INT4
INT5 Device Pin, PB5/INT5#
INT6 Device Pin, PB6/INT6
PF1 Device Pin, USB WAKEUP#
Tx1 & Rx1 Internal, UART1
Timer 2 Internal, Timer 2

续上面的资料，是较全的EZ-USB　Manual　Technical Reference中断资料：
The EZ-USB chip uses 8051 INT2 for 21 different USB interrupts: 16 bulk endpoints plus SOF,
Suspend, SETUP Data, SETUP Token, and USB Bus Reset. To help the 8051 determine which
interrupt is active, the EZ-USB core provides a feature called Autovectoring. The core inserts an
address byte into the low byte of the 3-byte jump instruction found at the 8051 INT2 vector
address. This second level of vectoring automatically transfers control to the appropriate USB
ISR. The Autovector mechanism, as well as the EZ-USB interrupt system is the subject of Chapter
9, "EZ-USB Interrupts."

请高手指点，刚开始看就很郁闷！看来问题很多．．

int2指的是中断号，决定了中断入口。

interrupt 0值得试中断优先级吧

int2指的是中断引脚，如果我理解的不错，当interrupt0产生时，int2管脚会有中断输出。
那些中断函数你只要不更改顺序就应该没问题。