AS3909 Просмотр технического описания (PDF) - austriamicrosystems AG
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AS3909 Datasheet PDF : 77 Pages
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Application Information
Writing of Data to Addressable Registers (WRITE
Mode)
SDATAI is sampled at the falling edge of SCLK (see Figure 14,
Figure 15). A SEN LOW pulse indicates the end of the WRITE
command after register has been written. Auto incrementing
address is supported, which means that if after the address and
first data byte some additional data bytes are sent, they are then
written to addresses incremented by 1. In case the command is
terminated by putting SEN low before a packet of 8 bits
composing one byte is sent, writing of this register is not
performed. In case the register on the defined address does not
exist or it is a read only register, no write is performed. Following
examples show cases of writing a single byte and writing
multiple bytes with auto-incrementing address.
Figure 14:
Writing of a Single Byte (falling edge sampling)
SEN
SCLK
SDATAI
X0
0
Two leading
Zeros indicate
WRITE Mode
A5 A4 A3 A2 A1 A0 D7 D6
SCLK raising
edge data is
transferred from
µC
SCLK
falling edge
Data is sampled
D5 D4
D3 D2 D1 D0
X
Data is moved to
Address
A5-A0
SEN falling
edge signals
end of WRITE
Mode
Figure 15:
Writing of Register Data with Auto-Incrementing Address
SEN
SCLK
SDATAI
X 0 0 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6
D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
Two leading
Zeros indicate
WRITE Mode
Data is moved to
Address
<A5-A0>
Data is moved to
Address
<A5-A0> + 1
Data is moved to
Address
<A5-A0> + (n-1)
Data is moved to
Address
<A5-A0> + n
X
SEN fall-
ing edge
signals
end of
WRITE
Mode
AS3909/AS3910 – 24
ams Datasheet, Confidential: 2013-Oct [3-02]
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