PCD5013 datasheet(49/76 Pages) PHILIPS

49 / 76 page

1999 Apr 12

Philips Semiconductors

Product speciﬁcation

FLEX

™ roaming decoder II

PCD5013

8.7.8.4

Hex/binary message

FLEX

™ hexadecimal/binary messages may be encoded

using any word size (blocking length) in the

range 1 to 16 bits. Words are placed in codewords along

with additional information about the message as

described in Tables 55 and 56 and these definitions.

The message data in Tables 55 and 56 have blocking

lengths of 4 bits; words are designated lower case letters

a, b, c, d etc.

Hexadecimal/binary messages can be sent as fragments.

See Section 8.8.6 for a description of message

fragmentation. Messages and message fragments are

terminated, or interrupted in the case of a non-terminating

fragment, on the last full character boundary in the last

codeword. Unused bits are cleared if the last valid data bit

is logic 1, or set if the last valid data bit is logic 0. If the

terminating fragment exactly fills its last codeword, an

additional codeword is sent to indicate the location of the

last character. This codeword is filled with logic 0s if the

last valid data bit is logic 1 and filled with logic 1s if the last

valid data bit is logic 0.

Fields K to N make up the first word of a message and the

first word of every fragment in a long message.

K: 12-bit fragment checksum (Tables 55 and 56).

See Section 8.8.7 for a description of message

checksums.

C: 1-bit message continued flag (Tables 55 and 56).

When this bit is set, fragments of this message are to be

expected in following frames. See Section 8.8.6 for a

description of message fragmentation.

F: 2-bit message fragment number (Tables 55 and 56).

This is a modulo 3 message fragment number which is

incremented by 1 in successive message fragments.

See Section 8.8.6 for a description of message

fragmentation.

N: message number (Tables 55 and 56).

See Section 8.8.8 for a description of message

numbering.

H: 1-bit header message flag (Table 55). It is a header

message only when this bit is set, otherwise it is a data

message. A header message is a displayable tag

associated with a non-displayable data message.

The header message (which is sent first) and the data

message, both have the same message number.

The second codeword of the first fragment of a hex/binary

message contains fields R to S. These fields are only

transmitted in the first fragment of a message.

R: message retrieval flag (Table 55). When this bit is set,

the pager expects this message to be numbered.

See Section 8.8.8 for a description of message

numbering.

s: 5-bit field reserved for future use (Table 55).

Default value = 00000.

M: 1-bit mail drop flag, see Table 55. When this bit is set,

the message is to be stored in a special area in memory to

overwrite existing data in the same memory space.

D: 1-bit display direction field (Table 55). D = 0 display left

to right, D = 1 display right to left (valid only when data sent

as characters i.e. blocking length not equal 0001).

B: 4-bit blocking length (Table 55). Indicates bits per

character. B3B2B1B0 = 0001 = 1-bit per character

(binary/transparent data), 1111 = 15 bits per character,

0000 = 16 bits per character. Data with a blocking length

other than 1 is assumed to be displayed on a character by

character basis (default value = 0001). Note: Tables 55

and 56 show B = 4-bit blocking length.

S: 8-bit signature field (Table 55). The 1’s complement of

the binary sum, taken 8 bits at a time, over the total

message prior to formatting into fragments. The first 8 bits

following the signature field are summed with the following

8 bits, b3b2b1b0a3a2a1a0 +d3d2d1d0c3c2c1c0, etc.

continuing to the last valid data bit in the last word of the

last fragment (the sum does not include termination bits).

The 8 LSBs of the result are inverted (1’s complement)

and transmitted as the message signature.

8.7.8.5

Secure message

FLEX

™ secure messages are encoded using the 7-bit

FLEX

™ alphanumeric character set (Section 8.7.8.3).

These characters are placed in codewords along with

additional information about the message as described in

Table 57 and the following definitions. In Table 57, 7-bit

characters of the message are designated lower case

letters a, b, c, d etc.

Secure messages follow the same fragmentation and

termination rules as alphanumeric messages

(Section 8.7.8.3).

K: 10-bit fragment checksum (Table 57).

See Section 8.8.7 for a description of message

checksums.

C: 1-bit message continued flag (Table 57). When this bit

is set, fragments of this message are to be expected in

following frames. See Section 8.8.6 for a description of

message fragmentation.

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