W83L517D Datasheet, PDF (59/138 Pages) Winbond – LPC SUPER I/O

W83L517D
Version 0.6
5.2.1 Set0.Reg0 - Receiver/Transmitter Buffer Registers (RBR/TBR) (Read/Write)
Receiver Buffer Register is read only and Transmitter Buffer Register is write only. When operating in
the PIO mode, the port is used to Receive/Transmit 8-bit data.
When function as a legacy IR, this port only supports PIO mode. If set in the advanced IR mode and
configured as MIR/FIR/Remote IR, this port also can support DMA transmission. Two DMA channels can
be used simultaneously, one for TX DMA and the other for RX DMA. Therefore, single DMA channel is
also supported when the bit of D_CHSW (DMA Channel Swap, in Set2.Reg2.Bit3) is set and the TX/RX
DMA channel is swapped. Note that two DMA channels can be defined in configure register CR2A,
which selects DMA channel or disables DMA channel. If only RX DMA channel is enabled while TX DMA
channel is disabled, then the single DMA channel will be selected.
5.2.2 Set0.Reg1 - Interrupt Control Register (ICR)
Mode
B7
B6
B5
B4
B3
Legacy IR 0
Advanced IR ETMRI
0
EFSFI
0
0
0
ETXTHI EDMAI 0
B2
EUSRI
EUSRI/
TXURI
B1
B0
ETBREI ERDRI
ETBREI ERBRI
The advanced IR functions including Advanced SIR/ASK-IR, MIR, FIR, or Remote IR are described
below.
Bit 7:
Legacy IR Mode:
Not used. A read will return 0.
Advanced IR Mode:
ETMRI - Enable Timer Interrupt
A write to 1 will enable timer interrupt.
Legacy IR Mode:
Bit6:
Legacy IR Mode:
Not used. A read will return 0.
MIR, FIR mode:
EFSFI - Enable Frame Status FIFO Interrupt
A write to 1 will enable frame status FIFO interrupt.
Advanced SIR/ASK-IR, Remote IR:
Not used.
Bit 5:
Legacy IR Mode:
Not used. A read will return 0.
Advanced SIR/ASK-IR, MIR, FIR, Remote IR:
ETXTHI - Enable Transmitter Threshold Interrupt
A write to 1 will enable transmitter threshold interrupt.
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Publication Release Date: Apr. 2000
Revision 0.60