HT9580 datasheet(28/63 Pages) HOLTEK

28 / 63 page

HT9580

April 28, 2000

Preliminary

M e s s age B u f f er

A ddr es s C o dew or d

M e s s age C odew or d 1

M e s s age C odew or d 2

M e s s age C odew or d 44

M e s s age C odew or d 45

N/ A

0040 H

0041H

0042 H

006C H

006D H

B i t7 B i t6 B i t5 B i t4 B i t3 B i t2 B i t1B i t0

010

0031H

M e s s age B u f f er

M e s s age C odew or d 46

M e s s age C odew or d 47

M e s s age C odew or d 48

0040 H

0041H

0042 H

M e s s age C odew or d 49

0043 H

M e s s age C odew or d 50

0044 H

0045 H

N/ A

1s t D a t a R eady I nt er r upt

B i t7 B i t6 B i t5 B i t4 B i t3 B i t2 B i t1B i t0

0031H

2nd D a t a R eady I nt er r u p t

1010

Example 2

Example 2: if the data read from 0031H is

²2EH² when a new data ready interrupt oc-

curred, that means the data length of this call is

more than 46 and the next data ready interrupt

will occur. If the next interrupt occurs and the

contents of 0031H is ²85H², the result are

shown in the following figure. The programmer

should note that the information on the mes-

sage buffer must be read out before the next

continuous codeword arrives. Otherwise the

data on the message will be overwritten.

The data ready interrupt will generate when

message is terminated, synchronization code

word is received or buffer is full. The following

figure will show the typical operation.

F r am e5

Sy n c

PO C S AG D AT A

St r u c t u r e

NM I

DR_ F G

M e s s age B u f f er

( 46 by t e s )

F r am e6

F r am e7

F r am e0

F r am e1F r am e2

Va l i d D a t a

The timing chart of message buffer

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