W83877TF Datasheet, PDF (109/154 Pages) Winbond – I/O chip disk drive adapter

W83877TF
IR MODE IR FUNCTION
IRTX
00X
Disable
tri-state
010*
IrDA
Active pulse 1.6 µS
011*
IrDA
Active pulse 3/16 bit time
100
ASK-IR
Inverting IRTX pin
101
ASK-IR
Inverting IRTX & 500 KHZ clock
110
ASK-IR
Inverting IRTX
111*
ASK-IR
Inverting IRTX & 500 KHZ clock
Note: The notation is normal mode in the IR function.
IRRX
high
Demodulation into SINB
Demodulation into SINB
routed to SINB
routed to SINB
Demodulation into SINB
Demodulation into SINB
The SIR schematic diagram for registers CRC and CRD is shown below.
16550A
SIN
UART2
SOUT
Transmission
Time Frame
HUPLX
(CRD.bit3)
IRRX1 _SIN2
1
MUX0
1
MUX 0
RX2INV _URIRSEL ^IRMODE2,1=00
(CRC.bit1) _(CRC.bit3)
IRMODE2
(CRD.bit2)
IRDA Mod.
3/16
1
IRDA Mod.
Mod1.6u
0 MUX
IRDA
500KHZ
IRMODE0
(CRD.bit0)
1
0 MUX
Demodulation
IR-DA
1
MUX 0
IRMODE1
(CRD.bit1)
0
1 MUX
IRMODE2
(CRD.bit2)
Demodulation
ASK_IR
01
00
10
MUX11
IRRX2
+5V
NCS0 (default)
+5V
SIRRX1~0
CR0D.bit5,4
0
1 MUX
TX2INV
URIRSEL CRC.bit0
(CRC,bit3)
11,00
01
MUX10
disable
IRTX1 _SOUT2
IRTX2 _{NCS1 (default)}
SIRTX1~0
CRD.bit7,6
IRMODE0
(CRD.bit0)
8.2.15 Configuration Register E (CR0E), Configuration Register F (CR0F)
Reserved for testing. Should be kept all 0's.
- 83 -
Publication Release Date: March 1998
Version 0.61