IRCC2.0 datasheet(10/87 Pages) SMSC

10 / 87 page

Consumer IR mode is enabled with the Block

Control Bits in SCE Configuration Register A

(see page 32).

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).

The relationship

between the divider value (CFD) and the carrier

frequency (Fc) is as follows:

CFD = (1.6MHz/Fc) - 1

For example, program the Carrier Frequency

Divider register with 41 ('29'Hex) for a 38kHz TV

Remote:

Fc = 38.095kHz.

This is ~.25%

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

demodulate

carrier

from

the

incoming serial data stream.

SCE

Transmit Bit-Rate

Divider

Carrier Frequency

Divider

Clock

Programmable

Receive Carrier

Sense

Receive Bit-Rate

Divider

TV Tx

Tx Enable

Range

Sync

Rx Enable

Encoder/Decoder

Carrier Off

TV Rx

FIGURE 4 - IrCC 2.0 CONSUMER IR (REMOTE CONTROL) BLOCK

IRCC2.0 Datasheet(PDF) 10 Page - SMSC Corporation

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