參數(shù)資料
型號(hào)： HT9480
廠商： Holtek Semiconductor Inc.
英文描述： Pager Controller
中文描述： 傳呼機(jī)控制器
文件頁(yè)數(shù)： 31/57頁(yè)
文件大?。?/td> 1541K
代理商： HT9480
Error indication
After error correction, any code-word contain-
ing more than two bits random error or four bits
burst error (option) in address or message code-
word may be indicated from the error flag posi-
tion.
Data transfer
Data transfer is initiated once the code-word is
already received. When the HT9480 is ready to
transfer the received call data, an external in-
terrupt will be generated via output INT. Any
message data can be read by accessing the 1FH
address of the
μ
C RAM map via the
μ
C internal
bus.
The address word indicates call address, func-
tion bit setting, and decoder flags. The message
code-words are received and concatenated to a
valid call address word. The message words
derived from un-corrected message code-words.
Data transfer for a received call ends right after
the termination word is transferred.
Address word format
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
Sync.
State
Call
address
Dup.
Call
0
Function
code
Bit 0: Bit 21 of the address code-word
Bit 1: Bit 20 of the address code-word
Bit 2=0 is to tell the difference between termi-
nation and address word format
Bit 3=1 if a duplicate code-word.
Bit 6
Bit 5
Bit 4
Call Address
0
0
0
RIC A
0
0
1
RIC B
0
1
0
RIC C
0
1
1
RIC D
1
0
0
RIC E
1
0
1
RIC F
1
1
0
—
1
1
1
—
Bit 7= 1 if an address code-word is received in
the data fail mode.
Interrupt indication
The HT9480 provides an internal data ready
interrupt and a battery fail interrupt. The in-
ternal data ready interrupt and battery fail
interrupt share the same pin connection.
Checking the battery fail interrupt bit (BF; bit
4 of 1EH) and the data ready interrupt bit (DR;
bit 7 of 1 E H) will tell which type of interrupt
has occurred. Both interrupt bits are active
low.
Out-of-range indication
The out-of-range condition occurs when the
time interval defined by SPF06, SPF07 does not
receive any preamble or sync code word. This
signal will be used as “l(fā)oss of RF signal” indica-
tor.
HT9480
31
23th Feb ’98
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