PC87365 datasheet(108/215 Pages) NSC

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3.0 System Wake-Up Control (SWC) (Continued)

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3.4.27

CEIR Wake-Up Range 1 Registers

These registers define the low and high limits of time range 1. The values are represented in units of 0.1 msec.

For the RC-5 protocol, the pulse width defining a half-bit cell must fall within this range in order for the cell to be considered valid.

The nominal pulse width is 0.889 for a 38 KHz carrier. IRWTR1L and IRWTR1H should be set to 07h and 0Bh, respectively (de-

fault).

For the NEC protocol, the time between two consecutive CEIR pulses that encodes a bit value of 1 must fall within this range.

The nominal time for a 1 is 2.25 msec for a 36 KHz carrier. IRWTR1L and IRWTR1H should be set to 14h and 19h respectively.

IRWTR1L Register

This register is set to 07h on power-up of VPP or software reset.

Location:

Bank 1, Offset 1Ah

Type:

R/W

IRWTR1H Register

This register is set to 0Bh on power-up of VPP or software reset.

Location:

Bank 1, Offset 1Bh

Type:

R/W

3.4.28

CEIR Wake-Up Range 2 Registers

These registers define the low and high limits of time range 2. The values are represented in units of 0.1 msec. These reg-

isters are not used when the RC-5 protocol is selected.

For the NEC protocol, the header pulse width must fall within this range in order for the header to be considered valid. The

nominal value is 9 msec for a 38 KHz carrier. IRWTR2L and IRWTR2H should be set to 50h and 64h respectively (default).

IRWTR2L Register

This register is set to 50h on power-up of Vpp or software reset.

Location:

Bank 1, Offset 1Ch

Type:

R/W

IRWTR2H Register

This register is set to 64h on power-up of Vpp or software reset.

Location:

Bank 1, Offset 1Dh

Type:

R/W

Bit

76543210

Name

Reserved

CEIR Pulse Change, Range 1, Low Limit

Reset

00000111

Bit

76543210

Name

Reserved

CEIR Pulse Change, Range 1, High Limit

Reset

00001011

Bit

76543210

Name

CEIR Pulse Change, Range 2, Low Limit

Reset

01010000

Bit

76543210

Name

CEIR Pulse Change, Range 2, High Limit

Reset

01100100

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