w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 74

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
MIR, FIR modes:
Advanced SIR/ASK-IR, Remote IR modes: Not used.
MIR, FIR, Remote IR Modes:
Advanced SIR/ASK-IR modes:
MIR, FIR modes:
Remote Controller Mode: Not used.
TMR_I - Timer Interrupt.
Set to 1 when timer counts to logical 0. This bit is valid when: (1) the timer registers are
defined in Set4.Reg0 and Set4.Reg1; (2) EN_TMR(Enable Timer, in Set4.Reg2.Bit0) is
set to 1; (3) ENTMR_I (Enable Timer Interrupt, in Set0.Reg1.Bit7) is set to 1.
FSF_I - Frame Status FIFO Interrupt.
Set to 1 when Frame Status FIFO is equal or larger than the threshold level or Frame
Status FIFO time-out occurs.
threshold level.
TXTH_I - Transmitter Threshold Interrupt.
Set to 1 if the TBR (Transmitter Buffer Register) FIFO is below the threshold level.
Cleared to 0 if the TBR (Transmitter Buffer Register) FIFO is above the threshold level.
DMA_I - DMA Interrupt.
Set to 1 if the DMA controller 8237A sends a TC (Terminal Count) to I/O device which
might be a Transmitter TC or a Receiver TC. Cleared to 0 when this register is read.
HS_I - Handshake Status Interrupt.
Set to 1 when the Handshake Status Register has a toggle. Cleared to 0 when
Handshake Status Register (HSR) is read. Note that in all IR modes including SIR, ASK-
IR, MIR, FIR, and Remote Control IR, this bit defaults to be inactive unless IR Handshake
Status Enable (IRHS_EN) is set to 1.
USR_I - IR Status Interrupt.
Set to 1 when overrun error, parity error, stop bit error, or silent byte error is detected and
registered in the IR Status Register (USR). Cleared to 0 when USR is read.
FEND_I - Frame End Interrupt.
Set to 1 when (1) a frame has a grace end to be detected where the frame signal is
defined in the physical layer of IrDA version 1.1; (2) abort signal or illegal signal has been
detected during receiving valid data. Cleared to 0 when this register is read.
TXEMP_I - Transmitter Empty.
Set to 1 when transmitter (or, say, FIFO + Transmitter) is empty. Cleared to 0 when this
register is read.
RXTH_I - Receiver Threshold Interrupt.
Set to 1 when (1) the Receiver Buffer Register (RBR) is equal or larger than the threshold
level; or (2) RBR time-out occurs if the receiver buffer register has valid data and is
below the threshold level. Cleared to 0 when RBR is less than threshold level after
reading RBR.
Cleared to 0 when Frame Status FIFO is below the
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Publication Release Date:April 1998
W83977ATF
PRELIMINARY
Revision 0.52