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Bits 5 to 3—Serial Clock Select (CKS2 to CKS0): These bits, together with the IICX1 (channel
1) or IICX0 (channel 0) bit in the SCRX register, select the serial clock frequency in master mode.
They should be set according to the required transfer rate.
SCRX
Bit
5 or 6 Bit 5
Bit 4
IICX
CKS2 CKS1 CKS0 Clock
0
0
0
1
1
0
1
1
0
0
1
1
0
1
Bit 3
ø =
5 MHz
0
ø/28
179 kHz
1
ø/40
125 kHz
0
ø/48
104 kHz
1
ø/64
78.1 kHz
0
ø/80
62.5 kHz
1
ø/100 50.0 kHz
0
ø/112 44.6 kHz
1
ø/128 39.1 kHz
0
ø/56
89.3 kHz
1
ø/80
62.5 kHz
0
ø/96
52.1 kHz
1
ø/128 39.1 kHz
0
ø/160 31.3 kHz
1
ø/200 25.0 kHz
0
ø/224 22.3 kHz
1
ø/256 19.5 kHz
Transfer Rate
ø =
ø =
8 MHz
10 MHz
286 kHz
357 kHz 571 kHz 714 kHz 893 kHz
200 kHz
250 kHz 400 kHz 500 kHz 625 kHz
167 kHz
208 kHz 333 kHz 417 kHz 521 kHz
125 kHz
156 kHz 250 kHz 313 kHz 391 kHz
100 kHz
125 kHz 200 kHz 250 kHz 313 kHz
80.0 kHz 100 kHz 160 kHz 200 kHz 250 kHz
71.4 kHz 89.3 kHz 143 kHz 179 kHz 223 kHz
62.5 kHz 78.1 kHz 125 kHz 156 kHz 195 kHz
143 kHz
179 kHz 286 kHz 357 kHz 446 kHz
100 kHz
125 kHz 200 kHz 250 kHz 313 kHz
83.3 kHz 104 kHz 167 kHz 208 kHz 260 kHz
62.5 kHz 78.1 kHz 125 kHz 156 kHz 195 kHz
50.0 kHz 62.5 kHz 100 kHz 125 kHz 156 kHz
40.0 kHz 50.0 kHz 80.0 kHz 100 kHz 125 kHz
35.7 kHz 44.6 kHz 71.4 kHz 89.3 kHz 112 kHz
31.3 kHz 39.1 kHz 62.5 kHz 78.1 kHz 97.7 kHz
ø =
ø =
16 MHz
20 MHz
ø =
25 MHz
703
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