PC87366 datasheet(110/240 Pages) NSC

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

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3.4.29

CEIR Wake-Up Range 3 Registers

These registers define the low and high limits of time range 3. 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 post header gap width must fall within this range in order for the gap to be considered valid. The

nominal value is 4.5 msec for a 36 KHz carrier. IRWTR3L and IRWTR3H should be set to 28h and 32h respectively (default).

IRWTR3L Register

This register is set to 28h on power-up of Vpp or software reset.

Location:

Bank1, Offset 1Eh

Type:

R/WS

IRWTR3H Register

This register is set to 32h on power-up of Vpp or software reset.

Location:

Bank 1, Offset 1Fh

Type:

R/W

CEIR Recommended Values

Table 43 lists the recommended time ranges limits for the different protocols and their four applicable ranges. The values

are represented in hexadecimal code where the units are of 0.1 msec.

Bit

76543210

Name

CEIR Pulse Change, Range 3, Low Limit

Reset

00101000

Bit

76543210

Name

CEIR Pulse Change, Range 3, High Limit

Reset

00110010

Table 43. Time Range Limits for CEIR Protocols

Range

RC-5

NEC

RCA

Low Limit

High Limit

Low Limit

High Limit

Low Limit

High Limit

10h

14h

09h

0Dh

0Ch

12h

07h

0Bh

14h

19h

16h

1Ch

−−

50h

64h

B4h

DCh

−−

28h

32h

23h

2Dh

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