AS3932 데이터 시트보기 (PDF) - austriamicrosystems AG
부품명
상세내역
제조사
AS3932 Datasheet PDF : 33 Pages
| |||
AS3932
Data Sheet - Detailed Description
8.3.3.1 SDI Command Structure
To program the SDI the CS signal has to go high. A SDI command is made up by a two bytes serial command and the data is sampled on the
falling edge of SCLK. The Table 9 shows how the command looks like, from the MSB (B15) to LSB (B0). The command stream has to be sent to
the SDI from the MSB (B15) to the LSB (B0).
Table 9. SDI Command Structure
Mode
Register address / Direct Command
Register Data
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
The first two bits (B15 and B14) define the operating mode. There are three modes available (write, read, direct command) plus one spare (not
used), as shown in Table 10.
Table 10. SDI Command Structure
B15
B14
Mode
0
0
WRITE
0
1
READ
1
0
NOT ALLOWED
1
1
DIRECT COMMAND
In case a write or read command happens the next 5 bits (B13 to B9) define the register address which has to be written respectively read, as
shown in Table 11.
Table 11. SDI Command Structure
B13
B12
B11
B10
B9
B8
Read/Write register
0
0
0
0
0
0
R0
0
0
0
0
0
1
R1
0
0
0
0
1
0
R2
0
0
0
0
1
1
R3
0
0
0
1
0
0
R4
0
0
0
1
0
1
R5
0
0
0
1
1
0
R6
0
0
0
1
1
1
R7
0
0
1
0
0
0
R8
0
0
1
0
0
1
R9
0
0
1
0
1
0
R10
0
0
1
0
1
1
R11
0
0
1
1
0
0
R12
0
0
1
1
0
1
R13
The last 8 bits are the data that has to be written respectively read. A CS toggle high-low-high terminates the command mode.
If a direct command is sent (B15-B14=11) the bits from B13 to B9 defines the direct command while the last 8 bits are omitted. The Table 12
shows all possible direct commands:
Table 12. List of Direct Commands
COMMAND_MODE
B13
B12
B11
B10
B9
B8
clear_wake
0
0
0
0
0
0
reset_RSSI
0
0
0
0
0
1
www.austriamicrosystems.com/AS3932
Revision 1.2
16 - 33
Share Link: 