PCF5001H 查看數據表（PDF） - Philips Electronics
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PCF5001H Datasheet PDF : 44 Pages
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Philips Semiconductors
POCSAG Paging Decoder
Product specification
PCF5001
7.15 Serial communication call data format
Table 4 Address word format
FUNCTION CODE
CALL ADDRESS
BIT 0 (LSB) BIT 1 (MSB) BIT 2 BIT 3 RIC
Bit 21 of
bit 20 of
0
0
A
address
address
0
1
B
codeword
codeword
1
0
C
1
1
D
BIT 4
1
SYNC STATUS
BIT 5
0 = Data
Receive;
1 = Data fail
DUPLEX CALL
BIT 6
1 = Duplex Call
time-out active
BIT 7
0
Table 5 Message word format
BIT 0
LSB
BIT 1
BIT 2
BIT 3
message bits
Note
1. Bit 7 = 1, if message codeword could not be corrected.
Table 6 Termination word format
BIT 0
0
BIT 1
0
BIT 2
1
Note
1. Bit 7 = 1, if call termination on error.
BIT 3
0
BIT 4
BIT 4
0
BIT 5
BIT 5
0
BIT 6
MSB
BIT 7(1)
error flag
BIT 6
0
BIT 7(1)
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
SPF13
0
1
1
1
FUNCTION BITS
BIT 20 (MSB)
X(1)
0
X(1)
1
BIT 21 (LSB)
X(1)
0
1
X(1)
Note
1. X = don’t care.
MESSAGE FORMAT
numeric
numeric
alphanumeric
alphanumeric
1997 Mar 04
21
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