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SCLK
MSB (0)
DR
RFS
Figure 13.7 SPORT To AD7872 ADC Timing
RFS is configured for the alternate framing mode, externally generated,
with inverted (active low) logic. The SPORT must also be programmed for
external serial clock and a serial word length of 16 bits. The configuration
of the SPORT control register for this application is shown in Figure 13.8.
15
14
13
0
1
SCLK generated
externally
Receive framing
required
Alternate receive
framing
Internally
generated RFS
Figure 13.8 SPORT To AD7872 ADC Control Register Settings
Hardware Examples
0
SPORT0 Control Register: 0x3FF6
SPORT1 Control Register: 0x3FF2
12
11
10
9
8
1
1
7
6
5
4
3
0
0
0
1
Word Length = 16 bits
Data format = right justify, zero fill
13
LSB
2
1
0
1
1
1
Inverted RFS
13 – 11
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