HT9580 datasheet(39/63 Pages) HOLTEK

39 / 63 page

R.F. timing chart

HT9580

April 28, 2000

Preliminary

· Out-of-range indication

The out-of-range condition occurs when the

time interval defined by SPF06, SPF07 is un-

able to receive sync code words. If sync code

words are detected, the timer counter defined

by SPF06, SPF07 will reset. This signal will

be seen as a loss of RF signal indication and

the power on reset is in an out-of-range condi-

tion until the sync code word is detected.

· Duplicate call suppression

The HT9580 provides a duplicate call sup-

pression with time-out facility, to identify du-

plicate call reception. In the display pager

mode, duplicate call indication is achieved

only via the mC interface. A call is assumed to

be a duplicate if its latest address and func-

tion bit setting is equal to the previous re-

ceived call within the time interval defined by

SPF06, SPF07.

· Receiver, Quick charge and PLL signal control

Pager receiver, quick charge circuit, and RF

PLL circuit can be controlled independently

via enable outputs BS1, BS2, and BS3 respec-

tively. Their operating period are optimized

according to the synchronization mode of the

decoder. Each enable signal has its own pro-

grammable establishment time.

Receiver Establishment

Time TBS1

Option

512 bps

1200/2400 bps SPF00 SPF01

7.81ms

53.33ms

15.63ms

6.67ms

31.25ms

13.33ms

62.50ms

26.67ms

Quick Charge

Adjustment Time TBS2

Option

512 bps

1200/2400 bps SPF02 SPF03

7.81ms

1.67ms

15.63ms

6.67ms

15.63ms

11.67ms

19.53ms

13.33ms

PLL Establishment Time

TBS3

Option

512 bps

1200/2400 bps SPF04 SPF05

0ms

31.25ms

26.67ms

46.87ms

40.00ms

62.50ms

53.33ms

Da t a I n

BS 1

BS 2

BS 3

Da t a B i t s

T BS 1

T BS 2

T BS 3

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