W83977F Datasheet, PDF (70/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
4.2.5 Set0.Reg4 - Handshake Control Register (HCR)
Mode
B7
B6
B5
B4
Legacy IR
0
0
0
XLOOP
Advanced IR AD_MD2 AD_MD1 AD_MD0 SIR_PLS
Reset Value
0
1
1
0
B3
EN_IRQ
TX_WT
0
PRELIMINARY
B2
B1
B0
0
0
0
EN_DMA 0
0
0
0
0
Legacy IR Register:
This register controls the pins of IR used for handshaking with peripherals such as modem, and
controls the diagnostic mode of IR.
Bit 4: When this bit is set to logical 1, the legacy IR enters diagnostic mode by an internal loopback:
IRTX is forced to logical 0, and IRRX is isolated from the communication link instead of the
TSR.
Bit 3: The legacy IR interrupt output is enabled by setting this bit to logic 1.
Advanced IR Register:
Bit 7~5 Advanced SIR/ASK-IR, MIR, FIR, Remote Controller Modes:
AD_MD2~0 - Advanced IR/Infrared Mode Select.
These registers are active when Advanced IR Select (ADV_SL, in Set2.Reg2.Bit0) is set
to 1. Operational mode selection is defined as follows. When backward operation
occurs, these registers will be reset to 0 and fall back to legacy IR mode.
AD_MD2~0
(Bit 7, 6, 5)
000
001
010
011
100
101
110
111
Selected Mode
Reserved
Low speed MIR (0.576M bps)
Advanced ASK-IR
Advanced SIR
High Speed MIR (1.152M bps)
FIR (4M bps)
Consumer IR
Reserved
Bit 4:
Bit 3:
MIR, FIR Modes:
SIR_PLS - Send Infrared Pulse
Writing 1 to this bit will send a 2 µ s long infrared pulse after physical frame end. This is
to signal to SIR that the high speed infrared is still in. This bit will be auto cleared by
hardware.
Other Modes: Not used.
MIR, FIR modes:
TX_WT - Transmission Waiting
If this bit is set to 1, the transmitter will wait for TX FIFO reaching threshold level or
transmitter time-out before it begins to transmit data which prevents short queues of data
bytes from transmitting prematurely. This is to avoid Underrun.
Other Modes: Not used.
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Publication Release Date: March 1998
Revision 0.58