PC87309VLJ datasheet(125/192 Pages) NSC

125 / 192 page

Enhanced Serial Port with IR -UART2 (Logical Device 2)

125

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Bits 3-0 - SIR Pulse Width Register (SPW)

Two codes for setting the pulse width are available. All

other values for this field are reserved.

0000:Pulse width is 3/16 of the bit period. (Default)

1101:Pulse width is 1.6

µsec.

Bits 7-4 - Reserved

Read/Write 0.

5.17.4

Link Control Register (LCR) and Bank Select

These registers are the same as the registers at offset 03h

in Bank 0.

5.17.5

Reserved Registers

Bank 6 registers with offsets 04h-07h are reserved.

5.18 BANK 7 – CONSUMER-IR AND OPTICAL

TRANSCEIVER CONFIGURATION REGISTERS

Bank 7 contains the registers that configure Consumer-IR

functions and infrared transceiver controls. See Table 5-22.

TABLE 5-22. Bank 7 Register Set

The Consumer-IR utilizes two carrier frequency ranges (see

also Table 5-26).

— Low range which spans from 30 KHz to 56 KHz, in

1 KHz increments, and

— High range which includes three frequencies:

400 KHz, 450 KHz or 480 KHz.

High and low frequencies are specified independently to al-

low separate transmission and reception modulation set-

tings. The transmitter uses the carrier frequency settings in

Table 5-26.

The four registers at offsets 04h through 07h (the infrared

transceiver configuration registers) are provided to config-

ure the Infrared Interface (the transceiver). The transceiver

mode is selected by up to three special output signals

(IRSL2-0). When programmed as outputs these signals are

forced to low when automatic configuration is enabled (AM-

CFG bit set to 1) and a UART mode is selected.

5.18.1

Infrared Receiver Demodulator Control

This register controls settings for Sharp-IR and Consumer

IR reception. After reset, the content of this register is 29h.

This setting selects a subcarrier frequency in a range be-

tween 34.61 KHz and 38.26 KHz for the Consumer-IR

mode, and from 480.0 to 533.3 KHz for the Sharp-IR mode.

The value of this register is ignored in both modes if the re-

ceiver demodulator is disabled. The available frequency

ranges for Consumer-IR and Sharp-IR modes are given in

Tables 5-23 through 5-25.

Bits 4-0 - Demodulator Frequency (DFR(4-0))

These bits select the subcarrier’s center frequency for

the Consumer-IR receiver demodulator. Table 5-25

shows the selection for low speed demodulation (bit 5 of

RCCFG=0, see page 128), and Table 5-24 shows the

selection for high speed demodulation (bit 5 of RC-

CFG=1).

Bits 7-5 - Demodulator Bandwidth (DBW(2-0))

These bits set the demodulator bandwidth for the select-

ed frequency range. The subcarrier signal frequency

must fall within the specified frequency range in order to

be accepted. Used for both Sharp-IR and Consumer-IR

modes.

See Tables 5-23, 5-25 and bit 5 (RXHSC) of the Con-

sumer-IR Configuration (RCCFG) Register on page

128.

Offset

Name

Description

00h

IRRXDC

Infrared Receiver Demodulator

Control Register

01h

IRTXMC

Infrared Transmitter Modulator

Control Register

02h

RCCFG Consumer-IR Conﬁguration Reg-

ister

03h

LCR/BSR

Link Control Register/

Bank Select Register

04h

IRCFG1

Infrared Interface Conﬁguration

05h

Reserved

06h

IRCFG3

Infrared Interface Conﬁguration

07h

IRCFG4

Infrared Interface Conﬁguration

76543210

Reset

Required

(SIR_PW)

Bank 6,

SIR Pulse Width

SPW(3-0)

Offset 02h

Reserved

76543210

Reset

Required

Bank 7,

Demodulation Control

Infrared Receiver

DFR2

DFR4

DBW0

DBW1

DBW2

DFR0

DFR1

DFR3

Offset 00h

PC87309VLJ Datasheet(PDF) 125 Page - National Semiconductor (TI)

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