cx25840 Conexant Systems, Inc., cx25840 Datasheet - Page 190

• Manufacturer Part Number: cx25840
• Description: Video Decoder And Broadcast Audio
• Manufacturer: Conexant Systems, Inc.

Register Map
5-48
IR Interrupt Enable
[7:6]
[5]
[4]
[3:2]
[1]
[0]
IR Low-Pass Filter Low
[7:0]
IR Low-Pass Filter High
[7:0]
Bits
Bits
Bits
RZ
RW
RW
RZ
RW
R
RW
RW
Type
Type
Type
0
0
0
0
0
0
0x00
0x00
Default
Default
Default
RESERVED
TSE
RSE
RESERVED
ROE
RTE
LPF_LOW
LPF_HIGH
Name
Name
Name
Conexant
16-bit value is used as a modulus value to filter out pulses below
a minimum width. Filter counter is reloaded with modulus each
time programmed edge is encountered. Counter decrements
using the host bus clock, if next edge seen before counter
reaches 0, pulse measurement is discarded. If counter reaches 0
it retains this value until the next edge is seen. Whenever the
counter contains a 0, pulse measurements are saved to the RX
FIFO. A value of 0x0000 disables the filter function, and values
0x0001 through 0x0004 are not permitted.
Transmit FIFO Service Request Interrupt Enable
0 = Transmit FIFO/Idle interrupt disabled
1 = Transmit FIFO/Idle interrupt enabled
Receive FIFO Service Request Interrupt Enable
0 = Receive FIFO interrupt disabled
1 = Receive FIFO interrupt enabled
Receive FIFO Overrun Interrupt Enable
0 = Receive FIFO overrun interrupt disabled
1 = Receive FIFO overrun interrupt enabled
Receive Pulse Width Timer Time-out Interrupt Enable
0 = Receive pulse width timer time-out interrupt disabled
1 = Receive pulse width timer time-out interrupt enabled
Low-Pass Filter Modulus
16-bit value is used as a modulus value to filter out pulses below
a minimum width. Filter counter is reloaded with modulus each
time the programmed edge is encountered. Counter decrements
using the host bus clock, if the next edge is seen before the
counter reaches 0, the pulse measurement is discarded. If the
counter reaches 0 it retains this value until the next edge is seen.
Whenever the counter contains a 0, pulse measurements are
saved to the RX FIFO. A value of 0x0000 disables the filter
function, and values 0x0001 through 0x0004 are not permitted.
Low-Pass Filter Modulus
Description
Description
Description
CX25840/1/2/3 Data Sheet
Address 0x218
Address 0x219
Address 0x214
102284B
8/3/05