HT9580 datasheet(34/63 Pages) HOLTEK

34 / 63 page

HT9580

April 28, 2000

Preliminary

The filtered data is used to synchronize an in-

ternal clock generator by monitoring transi-

tions. The recovered clock phase can be

adjusted in steps of 1/8, 3/32, 1/16, or 1/32 bit

period per received bit.

All step size are used when bit synchroniza-

tion has not been achieved, the smallest when

a valid data sequence has been detected.

· Erroneous code-words

Upon receipt of erroneous uncorrectable

code-words, call termination occurs according

to the conditions given below:

SPF08 SPF09

Description

Any two consecutive

code-words or the

code-word directly following

the address code-word in

error

Any single code-word in error

Any two consecutive

code-words in error

· Message receiving mode

The receiving message mode (numeric or al-

pha-numeric) depends on bits SPF16~SPF19.

If one of these bits from SPF16~SPF19 is

cleared to low, the decoder will be in numeric

package receiving mode. Otherwise, the de-

coder is in the alphanumeric receiving mode.

An example is shown below:

Function Bits

Message Re-

ceiving Format

Bit 20 (MSB)

Bit 21 (LSB)

SPF16=0

Numeric (4-bit)

SPF17=0

Numeric (4-bit)

SPF18=1

Alphanumeric

(7-bit)

SPF19=1

Alphanumeric

(7-bit)

The decoder data output format is deter-

mined by the value SPF16~SPF19. When it is

logic low, the 4-bit (numeric) package will be

selected. Otherwise, the 7-bit (alphanumeric)

package is selected. The following tables illus-

trate the above two different conditions.

Message code-word on the message buffer (numeric receiving mode)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Error Flag

Message code-word on the message buffer (alphanumeric receiving mode)

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Error Flag

· Synch word indication

The synch word recognized by the HT9580 is

the standard POCSAG synchronization

code-word as shown in the following table.

Bit No.

0123456789

Bit

0111110011010010

Bit No. 16

Bit

0001010111011000

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