W83977AF Information Storage Devices, Inc, W83977AF Datasheet - Page 82

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

4.8.1 Set6.Reg0 - Infrared Configure Register 2 (IR_CFG2)
This register controls ASK-IR, MIR, FIR operations.
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 2:
Bit 1:
Bit 0:
4.8.2 Set6.Reg1 - MIR (1.152M/0.576M bps) Pulse Width
This 5-bit register sets MIR output pulse width.
IR_CFG2 SHMD_N SHDM_N FIR_CRC MIR_CRC
Reset Value
Reset Value
MIR_PW
Reg.
Reg.
M_PW4~0
00000
00001
00010
11111
SHMD_N - ASK-IR Modulation Disable
SHDM_N - ASK-IR Demodulation Disable
FIR_CRC - FIR (4M bps) CRC Type
Note that the 16/32-bit CRC are defined in IrDA 1.1 physical layer.
MIR_CRC - MIR (1.152M/0.576M bps) CRC Type
INV_CRC - Inverting CRC
When set to 1, the CRC is inversely output in physical layer.
DIS_CRC - Disable CRC
When set to 1, the transmitter does not transmit CRC in physical layer.
Reserved, write 1.
k
...
...
10
Bit 7
Bit 7
0
0
-
Bit 6
Bit 6
MIR_CRC
MIR Pulse Width (1.152M bps)
FIR_CRC
SHMD_N
SHDM_N
0
0
-
0
1
0
1
0
1
0
1
41.66 (==20.83*2) ns
20.83*k
Bit 5
Bit 5
20.83 ns
1
0
645 ns
-
0 ns
...
...
10
- 70 -
ns
M_PW4
Bit 4
Bit 4
IRTX modulate 500K Hz Square Wave
0
0
Demodulation 500K Hz
M_PW3
Demodulation Mode
W83977F/ W83977AF
Bit 3
Bit 3
Modulation Mode
0
1
-
MIR Output Width (0.576M bps)
Publication Release Date: March 1998
Re-rout IRRX
Re-rout IRTX
16-bit CRC
32-bit CRC
16-bit CRC
32-bit CRC
CRC Type
CRC Type
83.32 (==41.66*2) ns
INV_CRC DIS_CRC
M_PW2
Bit 2
Bit 2
41.66*k
0
0
41.66 ns
1290 ns
0 ns
...
...
PRELIMINARY
10
M_PW1
Bit 1
Bit 1
ns
0
1
Revision 0.58
M_PW0
Bit 0
Bit 0
0
0
-