HT9580 datasheet(38/63 Pages) HOLTEK

38 / 63 page

HT9580

April 28, 2000

Preliminary

· Address word format

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Sync. State

Call Address

Dup. Call

Valid Address

Function Code

Note: Bit0: Bit21 of the address code-word

Bit1: bit20 of the address code-word

Bit2: If this bit is ²1², the address word is valid, oterwise the address word is not valid.

Bit3: 1 for a duplicate code-word

Bit7: 1 if an address code-word is received in the data fail mode

Bit6

Bit5

Bit4

Call Address

RIC A

RIC B

RIC C

RIC D

RIC E

RIC F

· Interrupt indication

The HT9580 provides an internal data ready

interrupt and a battery fail interrupt. The in-

ternal data ready interrupt and battery fail

interrupt share the NMI location. Which in-

terrupt occurred can be determined by check-

ing the battery fail interrupt bit (BF_FG; bit 4

of 0006H) and the data ready interrupt bit

(DR_FG; bit 5 of 0006H). Both interrupt bits

are active high.

· Test mode

The test mode of the decoder is selected by set-

ting the TS pin low at any time. In the test

mode, the RF control outputs BS1 and BS3 are

constantly set high, but BS2 is set low. After the

TS pin is set high the decoder exits the test

mode.

· Message data transfer

The decoder outputs a deformatted address

word and message words upon receipt of a valid

call. The message data to be transferred is or-

ganized into 8-bit words and transferred to the

message buffer address (0040H to 006DH). The

data ready interrupt flag will be set high when

the received data (including address code-

word and message codeword) length is ter-

minated within 46 bytes, one batch is over

or if the 46 bytes data buffer is full if data

length is more than 46 bytes. If the data in

the message buffer is terminated, the

²MSG_END² (0031H) bit will set high.

The address word indicates call address,

functional bit setting, and decoder flags. The

message code-words are received and con-

catenated to a valid call address word. The

message words are derived from un-cor-

rected message code-words.

HT9580 Datasheet(PDF) 38 Page - Holtek Semiconductor Inc

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