IRCC2.0 SMSC Corporation, IRCC2.0 Datasheet - Page 10

no-image

IRCC2.0

Manufacturer Part Number
IRCC2.0
Description
Infrared Communications Controller
Manufacturer
SMSC Corporation
Datasheet
Consumer IR mode is enabled with the Block
Control Bits in SCE Configuration Register A
Carrier Frequency Divider
The Carrier Frequency Divider register is used to
program the ASK carrier frequency for the
transmit modulator and receive detector (Figure
5). The divider is eight bits wide.
The input clock to the Carrier Frequency Divider
is 1.6MHz (48MHz ÷ 30).
between the divider value (CFD) and the carrier
frequency (Fc) is as follows:
For example, program the Carrier Frequency
CFD = (1.6MHz/Fc) - 1
FIGURE 4 - IrCC 2.0 CONSUMER IR (REMOTE CONTROL) BLOCK
SCE
Rx Enable
The relationship
Receive Bit-Rate
Encoder/Decoder
Divider
Carrier Off
Sync
Clock
10
(see page 32).
Divider register with 41 ('29'Hex) for a 38kHz TV
Remote:
accuracy. Table 9 contains representative CFD
vs. Carrier Frequency relationships.
The Carrier Frequency range is 1.6MHz to
6.25kHz.
The carrier frequency encoder/decoder can be
defeated using the Carrier Off bit. When Carrier
Off is one, the transmitter outputs a non-
modulated SCE serial NRZ data stream at the
programmed bit rate; the receiver does not
attempt to demodulate a carrier from the
incoming serial data stream.
Transmit Bit-Rate
Carrier Frequency
Receive Carrier
Programmable
Tx Enable
Divider
Range
Sense
Divider
Fc = 38.095kHz.
TV Tx
TV Rx
This is ~.25%

Related parts for IRCC2.0