PCF5001 datasheet(21/44 Pages) PHILIPS

21 / 44 page

1997 Mar 04

Philips Semiconductors

Product speciﬁcation

POCSAG Paging Decoder

PCF5001

7.15

Serial communication call data format

Table 4

Address word format

Table 5

Message word format

Note

1. Bit 7 = 1, if message codeword could not be corrected.

Table 6

Termination word format

Note

1. Bit 7 = 1, if call termination on error.

FUNCTION CODE

CALL ADDRESS

BIT 4

SYNC STATUS

DUPLEX CALL

BIT 7

BIT 0 (LSB)

BIT 1 (MSB)

BIT 2

BIT 3

RIC

BIT 5

BIT 6

Bit 21 of

address

codeword

bit 20 of

address

codeword

0 = Data

Receive;

1 = Data fail

1 = Duplex Call

time-out active

BIT 0

BIT 1

BIT 2

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7(1)

LSB

message bits

MSB

error ﬂag

BIT 0

BIT 1

BIT 2

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7(1)

0010000

error ﬂag

7.16

Data conversion

The PCF5001 automatically converts message codewords

received in numeric or alphanumeric format into ASCII

format. Depending on SPF13 and the function bit setting in

the received address codeword a conversion takes place

as shown in Table 7.

When a conversion from alphanumeric format to ASCII

takes place, the received message codewords are split

into message blocks, seven bits in length. After adding the

error flag they are transferred as message words.

When a conversion from numeric format to ASCII takes

place, the received message codewords are split into

blocks, four bits in length. Each four bit block is converted

to a seven bit block as shown in Table 8. After adding the

error flag they are transferred as message words.

Table 7

Message data conversion

Note

1. X = don’t care.

SPF13

FUNCTION BITS

MESSAGE FORMAT

BIT 20 (MSB)

BIT 21 (LSB)

0X(1)

X(1)

numeric

1X(1)

alphanumeric

X(1)

alphanumeric

PCF5001 Datasheet(PDF) 21 Page - NXP Semiconductors

PCF5001 Datasheet(HTML) 21 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Download

Link URL