參數(shù)資料
型號: M66291GP
元件分類: 總線控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP48
封裝: 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁數(shù): 61/128頁
文件大?。?/td> 928K
代理商: M66291GP
M66291GP/HP
Rev 1.01 2004.11.01 page 36 of 122
2.14 Interrupt Status Register 2
Interrupt Status Register 2 (INT_STATUS2)
<Address : H’1C>
b15
14
13
12
11
10
9876
54321
b0
EPB_NRDY
0
00
-
<H/W reset : H'0000>
<S/W reset : H'0000>
<USB bus reset : ->
b
Bit name
Function
R
W
15~7
Reserved. Set it to “0”.
00
6~0
EPB_NRDY
Buffer Not Ready Interrupt
Read
0 :
No occurrence of interrupt
1 :
Occurrence of interrupt
Write
0 :
Clear interrupt
1 :
Invalid (Ignored when written)
b6 corresponds to EP6, ---b1 corresponds to EP1 and b0
corresponds to EP0.
(1) EPB_NRDY (Buffer Not Ready Interrupt) Bits (b6~b0)
The bit corresponding to each endpoint is set to “1” when IN token/OUT token is received with the buffer at
“not ready” state.
The “not ready” state refers to the state when EP0_PID bits and EPi_PID bits are set to BUF/STALL response
and means that the buffer could not be received and transmitted.
When this bit is set to “1”, if the EP0_PID and EPi_PID bits are set to BUF, NAK response is executed, and if
they are set to STALL, STALL response is executed.
When the EPB_NRE bit is set to “1”, if this bit is set to “1”, the INTN bit is set to “1”, causing the buffer not
ready interrupt to occur.
This bit is cleared by writing “0”.
Note:
In case the endpoint is set to isochronous transfer (set by EPi_TYP bits), the corresponding bit of this register
may be set to “1”. Hence, do not set the corresponding bit of the Interrupt Enable Register 2 to “1”.
NAK/STALL
OUT token
Data packet
packet
USB bus
SYNC PID
Addr Endp CRC EOP
SYNC PID
Data CRC EOP
SYNC PID
EOP
Interrupt output Occurrence of buffer not ready interrupt
because the buffer could not be received
Figure 2.9 Examples of Buffer Not Ready Interrupt Occurrence Timing (OUT transfer)
NAK/STALL
IN token
packet
USB bus
SYNC PID
Addr Endp CRC EOP
SYNC PID
EOP
Interrupt output Occurrence of buffer not ready interrupt
because the buffer could not be transmitted
Figure 2.10 Examples of Buffer Not Ready Interrupt Occurrence Timing (IN transfer)
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