PCD5008 datasheet(27/64 Pages) PHILIPS

27 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.6

Conﬁguration of the FLEX

™ CAPCODE

8.6.1

GENERAL

A CAPCODE specifies a decoder address, the collapse

value of the address and whether single-phase, any-phase

or all-phase address. The PCD5008 supports

single-phase and any-phase operation. The FLEX

™

protocol provides a standard mechanism to derive phase

and frame in which an address should be transmitted.

If this mechanism is not used, a CAPCODE also specifies

the phase and frame assigned to the address.

8.6.2

CAPCODE FORMAT

The FLEX

™ CAPCODE consist of a series of decimal and

alphabetic fields, see Fig.16 for the field definitions.

When the FLEX

™ standard pager collapse value of 4

(battery cycle of 16 frames) is used, the pager collapse

field can be omitted.

The collapse value is a number between 0 and 7 and

defines how often the decoding device looks for messages

on the FLEX

™ channel. For a given collapse value b, the

decoding device looks in every 2b frames. Thus an

address with an assigned base frame of 3 and a collapse

value of 5 typically looks for messages in frame 3 and

every 32 frames thereafter (i.e. frames 3, 35, 67 and 99).

Fig.16 CAPCODE format.

handbook, full pagewidth

MBK096

P 1 2 2 5 U 2 2 3 4 5 5 0 1 2 1

Frame field, optional 3 digit decimal

field, represents the frame number if

standard frame and phase

embedding rules are not used.

Roaming capability, optional

alphabetic character 'P'

indicates no roaming capabilities.

Pager collapse (battery cycle),

optional 1 digit decimal field

(mandatory if frame number

field is included) indicates pager

collapse value.

Address field, mandatory 7, 9 or 10 digit

decimal field, contains the information from

which the BCH address codewords for this

CAPCODE are derived.

CAPCODE type, mandatory

alphabetic character, indicates rules

for deriving phase and frame from

address field.

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