PC97338 datasheet(178/221 Pages) NSC

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5.21.2 IRTXMC – Infrared Transmitter

Modulator Control Register

Used to select the modulation subcarrier parameters

for CEIR and Sharp-IR modes. For Sharp-IR, only the

subcarrier pulse width is controlled by this register,

the subcarrier frequency is fixed at 500 kHz.

After reset, the content of this register is 69h, select-

ing a subcarrier frequency of 36 kHz and a pulse

width of 7

µs for CEIR, or a pulse width of 0.8 µs for

Sharp-IR.

FIGURE 88. Intrared Transmitter Modulator

Control Register

TABLE 96. CEIR Carrier Frequency Encoding

B4–0 MCFR [4–0] – Modulation Subcarrier Fre-

quency.

Selects the frequency for the CEIR modulation

subcarrier.

Encoding

Low Frequency,

TXHSC = 0

High Frequency,

TXHSC = 1

00000

Reserved

00001

Reserved

00010

Reserved

00011

30 kHz

400 kHz

00100

31 kHz

Reserved

00101

32 kHz

Reserved

00110

33 kHz

Reserved

00111

34 kHz

Reserved

321

Reset

Required

MCFR(2-0)

MCPW(2-0)

Reserved

01000

35 kHz

450 kHz

01001

36 kHz

Reserved

01010

37 kHz

Reserved

01011

38 kHz

480 kHz

01100

39 kHz

Reserved

01101

40 kHz

Reserved

01110

41 kHz

Reserved

01111

42 kHz

Reserved

10000

43 kHz

Reserved

10001

44 kHz

Reserved

10010

45 kHz

Reserved

10011

46 kHz

Reserved

10100

47 kHz

Reserved

10101

48 kHz

Reserved

10110

49 kHz

Reserved

10111

50 kHz

Reserved

11000

51 kHz

Reserved

11001

52 kHz

Reserved

11010

53 kHz

Reserved

11011

54 kHz

Reserved

11100

55 kHz

Reserved

11101

56 kHz

Reserved

11110

56.9 kHz

Reserved

11111

Reserved

Encoding

Low Frequency,

TXHSC = 0

High Frequency,

TXHSC = 1

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