W83977AF Information Storage Devices, Inc, W83977AF Datasheet - Page 70

• Manufacturer Part Number: W83977AF
• Description: W83877TF Plus Kbc, Cir, RTC
• Manufacturer: Information Storage Devices, Inc

4.2.5 Set0.Reg4 - Handshake Control Register (HCR)
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:
Bit 3: The legacy IR interrupt output is enabled by setting this bit to logic 1.
Advanced IR Register:
Bit 7~5
Bit 4:
Bit 3:
Advanced IR AD_MD2 AD_MD1 AD_MD0 SIR_PLS
Reset Value
Legacy IR
Mode
IRTX is forced to logical 0, and IRRX is isolated from the communication link instead of the
TSR.
Advanced SIR/ASK-IR, MIR, FIR, Remote Controller Modes:
MIR, FIR Modes:
Other Modes: Not used.
MIR, FIR modes:
Other Modes: Not used.
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.
occurs, these registers will be reset to 0 and fall back to legacy IR mode.
SIR_PLS - Send Infrared Pulse
Writing 1 to this bit will send a 2 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.
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.
B7
0
0
Operational mode selection is defined as follows.
AD_MD2~0
(Bit 7, 6, 5)
B6
000
001
010
011
100
101
110
111
0
1
B5
0
1
- 58 -
High Speed MIR (1.152M bps)
Low speed MIR (0.576M bps)
XLOOP
Advanced ASK-IR
B4
0
Selected Mode
Advanced SIR
Consumer IR
FIR (4M bps)
Reserved
Reserved
W83977F/ W83977AF
EN_IRQ
TX_WT
Publication Release Date: March 1998
B3
0
EN_DMA
When backward operation
B2
0
0
PRELIMINARY
Revision 0.58
B1
0
0
0
B0
0
0
0