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參數(shù)資料
| 型號： | ASCELL3912 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | ER 10C 10#16 SKT RECP LINE |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 122K |
| 代理商： | ASCELL3912 |
ISM 868 MHz, 433 MHz and 315 MHz FSK Receiver Cell – Preliminary Data Sheet
ASCell3912
Rev. A, February 2000
Page 7 of 14
Austria Mikro Systeme International AG
1.2.4 Receiver Status
Table 3 below shows the format of the state register. Bit b0 is the first which is transmitted by a
readout of the μC. The status register contains the information about a successful received date,
active receiver and the information about the quality of the received signal.
bit #
Name
Description
Status
Comments
0
DR
Data received a complete
message was received
L= no data received
H= data received successfully
1
RX
Receiver is active
L= receiver not active
H= data reception in progress
Note: This bit is set by the
receiver when 6 bytes of a
packet are correct. This bit in
the status register is neces-
sary for the comfort-orientated
functions of the central locking
functions.
2..3]
RQ[1:0]
Signal quality indicates
how many data packets
are necessary for a com-
plete message
L, L (RQ1, RQ0) = 1 packet
L, H = 2 packets
H, L = 3 packets
H, H =4 packets
Table 3:
Format of the status register.
1.2.5 μC Interface
The ASCell3912 contains a direct interface to a micro controller (μC). The μC interface of the
ASCell3912 consist of the following five pins:
”Transmit/Received data input/output” (DATA). A bi-directional serial data line, with states ”H”
(recessive, or weak pull-up) and ”L” (dominant).
“Active ”H” transmit data enable” (D_EN)
”Transmit data clock input” (D_CLK).
”Active ”H” μC interrupt output ” (RE_INT).
”Active ”H” μC wakeup output ” (μC_WAKEUP).
”μC clock output ” (μC_CLK).
1.2.5.1
The following table shows the instruction set of the interface. The first two bits are the operation
code, which determine the direction of the data transfer and which data is transferred.
Operation
code
0
1
LNA
FB1
FB0
STR5
STR4
STR3
0
0
Z
LNA
FB1
FB0
STR5
STR4
1
0
Z
DR
RX
RQ1
RQ0
1
1
Z
B0-b0
Instruction Set
Instruction or Data
Comment
STR2
STR1
STR0
Write ASCell3912 setup
STR3
STR2
STR1
STR0
Read ASCell3912 setup
Read ASCell3912-State
B15-b7
Read ASCell3912-Data
Table 4:
Overview of the instruction set.
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