HT9480 datasheet(29/57 Pages) HOLTEK

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Termination word format

Successful call termination occurs by the recep-

tion of a valid address code-word with less than

2 bit errors on the decoder output register.

Unsuccessful termination occurs when sync is

not detected.

Termination word format:

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

Error

Flag

Call data output format

The HT9480 automatically converts message

code-words received in numeric or alphanu-

meric format into ASCII format. Depending on

SPF09 and the function bit setting in the re-

ceived address code-word a conversion takes

place as shown in the following table.

Function Bits

Message

Format

SPF 09 Bit 20

Bit 21

numeric

100

numeric

alpha-numeric

When a conversion from alphanumeric format

to ASCII takes place, the received message

code-words 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 code-words

are split into blocks, four bits in length. Each

four bit block is converted to a seven bit block as

shown in the following table. After adding the

error flag they are transferred as message

words. Refer to the “Numeric format to ASCII

conversion” table.

There is a new message packaging method after

receipt of message code-words. The new mes-

sage packaging method is 4 bits packaging type.

Depending upon SPF20=1, message code-word

conversion takes place as show in the following

table.

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

Error

Flag

The received message code-words are split into

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

directly transferred to a four bit block. After

adding the error flag they are transferred as

message words.

HT9480

23th Feb ’98

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