W83637HF Datasheet, PDF (92/149 Pages) Winbond – LPC I/O

W83637HF
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
3210
0001
0110
0100
1100
0010
Interrupt set and function
Priority
Interrupt type
Interrupt source
Clear interrupt condition
-
-
No interrupt pending
-
first Data receiving status 1. OER = 1
Read SCSR
2. PBER = 1
3. NSER = 1
4. SBD = 1
second RBR data ready
1. RBR data ready
1. Read RBR
2. FIFO interrupt active 2. Read RBR until FIFO
level reached
is under active level
second FIFO data time out
Data present in Rx
Read RBR
FIFO for 4-character
period of time since last
access of Rx FIFO.
third TBR empty
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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Publication Release Date: June 25, 2003
Revision 1.3