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參數(shù)資料
型號: W83637HF
廠商: WINBOND ELECTRONICS CORP
英文描述: LPC I/O
中文描述: LPC的I / O
文件頁數(shù): 92/149頁
文件大小: 936K
代理商: W83637HF
W83637HF
Publication Release Date: June 25, 2003
- 87 -
Revision 1.3
Bit 7, 6: FIFO enabled status bits reflect what is set in bit 0 of SCFR (write only Smart Card FIFO
Register at base address + 2 when BDLAB = 0).
Bit 5: SCPSNT line status. User may poll this bit to see SCPSNT pin's voltage level.
Bit 4: SCPTI means SCPSNT toggle interrupt status. A rising/falling edge of SCPSNT signal triggers
an interrupt and set this status bit if ESCPTI (IER bit 3) is set to "1" to enable SCPSNT toggle
interrupt.
= 0
No SCPSNT toggle interrupt.
= 1
SCPSNT toggle interrupt occurs.
Bit 3 ~ 1: INTS2 ~ INTS0 mean interrupt status bit 2 ~ 0. The combination indicates which kind of
transmission-related interrupt has occurred. Refer to the following table for details.
ISR bit
2
Interrupt set and function
Interrupt source
3
1
0
Priority
Interrupt type
Clear interrupt condition
0
0
0
1
0
1
1
0
-
-
No interrupt pending
1. OER = 1
2. PBER = 1
3. NSER = 1
4. SBD = 1
1. RBR data ready
2. FIFO interrupt active
level reached
Data present in Rx
FIFO for 4-character
period of time since last
access of Rx FIFO.
TBR empty
-
first
Data receiving status
Read SCSR
0
1
0
0
second RBR data ready
1. Read RBR
2. Read RBR until FIFO
is under active level
Read RBR
1
1
0
0
second FIFO data time out
0
0
1
0
third
TBR empty
1. Write data to TBR
2. Read ISR (if priority is
third)
Bit 0: Interrupt pending status bit. This bit is a logical "1" if there is no interrupt pending. If one of the
interrupt sources occurs, this bit will be set to a logical "0".
= 0
Interrupt pending.
= 1
No interrupt occurs.
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