PC87338 datasheet(179/221 Pages) NSC

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5.21.3 RCCFG – CEIR Configuration

This register controls the basic operation of the CEIR

mode.

After reset, all bits are set to 0.

FIGURE 88. CEIR Configuration Register

5.21.4 LCR/BSR – Link Control/Bank

Select Registers

These registers are the same as in bank 0.

5.21.5 IRCFG [1–4] – Infrared Interface

Configuration Registers

Four registers are provided to configure the infrared

interface. These registers are used to select the infra-

red receiver inputs as well as the transceiver opera-

tional mode. Selection of the transceiver mode is

accomplished by up to three special output signals

(ID/IRSL [2–0]). When these signals are programmed

as outputs, they will be forced low when automatic

configuration is enabled (AMCFG bit set to 1) and

UART mode is selected.

B7–5 MCPW [2–0] – Modulation Subcarrier Pulse

Width.

Encoding

Low Frequency,

TXHSC = 0

(CEIR only)

High Frequency,

TXHSC = 1

(CEIR or Sharp-

IR)

000

Reserved

001

Reserved

010

µs

0.7

µs

011

µs

0.8

µs

100

µs

0.9

µs

101

10.6

µs

Reserved

110

Reserved

111

Reserved

B1–0 RC_MMD [1–0] – Transmitter Modulation

Mode.

Determines how infrared pulses are generated

from the transmitted bit string.

→ C_PLS Modulation Mode.Pulses are

generated continuously for the entire logic 0 bit

time.

→ 8_PLS Modulation Mode.8 pulses are

generated each time one or more logic 0 bits

are transmitted following a logic 1 bit.

→ 6_PLS Modulation Mode.6 pulses are

generated each time one or more logic 0 bits

are transmitted following a logic 1 bit.

654

Reset

Required

RCDM_DS

Reserved

RXHSC

T_OV

R_LEN

RC_MMD0

RC_MMD1

TXHSC

→ Reserved.Result is indeterminate.

TXHSC – Transmitter Subcarrier Frequency

Select.

Selects the frequency range for the modulation

subcarrier.

→ 30–56.9 kHz

→ 400–480 kHz

Reserved.

Write 0.

RCDM_DS – Receiver Demodulation Dis-

able.

When this bit is 1, the internal demodulator is

disabled. The internal demodulator, when en-

abled, performs subcarrier frequency checking

and envelope generation.

It must be disabled when demodulation is done

externally, or when oversampling mode is used

to determine the subcarrier frequency.

RXHSC – Receiver Subcarrier Frequency

Select.

Selects the frequency range for the receiver

demodulator.

→ 30–56.9 kHz

→ 400–480 kHz

T_0V – Receiver Sampling Mode.

→ Programmed-T-period sampling.

→ Oversampling Mode.

R_LEN – Run-Length Control.

When set to 1, run-length encoding/decoding

is enabled.

The format of a run-length code is YXXXXXXX,

where:

Y - Bit value

XXXXXXX— Number of bits minus 1.

(Selects 1 to 128 bits).

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