Product data
13
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 STCR register, select the serial clock frequency in master mode.
They should be set according to the required transfer rate.
STCR
Bit 5 or 6 Bit 5 Bit 4 Bit 3 Transfer Rate
IICX CKS2 CKS1 CKS0 Clock
ø =
5 MHz
ø =
8 MHz
ø =
10 MHz
ø =
16 MHz
ø =
20 MHz
0 0 0 0 ø/28 179 kHz 286 kHz 357 kHz 571 kHz* 714 kHz*
1 ø/40 125 kHz 200 kHz 250 kHz 400 kHz 500 kHz*
1 0 ø/48 104 kHz 167 kHz 208 kHz 333 kHz 417 kHz*
1 ø/64 78.1 kHz 125 kHz 156 kHz 250 kHz 313 kHz
1 0 0 ø/80 62.5 kHz 100 kHz 125 kHz 200 kHz 250 kHz
1 ø/100 50.0 kHz 80.0 kHz 100 kHz 160 kHz 200 kHz
1 0 ø/112 44.6 kHz 71.4 kHz 89.3 kHz 143 kHz 179 kHz
1 ø/128 39.1 kHz 62.5 kHz 78.1 kHz 125 kHz 156 kHz
1 0 0 0 ø/56 89.3 kHz 143 kHz 179 kHz 286 kHz 357 kHz
1 ø/80 62.5 kHz 100 kHz 125 kHz 200 kHz 250 kHz
1 0 ø/96 52.1 kHz 83.3 kHz 104 kHz 167 kHz 208 kHz
1 ø/128 39.1 kHz 62.5 kHz 78.1 kHz 125 kHz 156 kHz
1 0 0 ø/160 31.3 kHz 50.0 kHz 62.5 kHz 100 kHz 125 kHz
1 ø/200 25.0 kHz 40.0 kHz 50.0 kHz 80.0 kHz 100 kHz
1 0 ø/224 22.3 kHz 35.7 kHz 44.6 kHz 71.4 kHz 89.3 kHz
1 ø/256 19.5 kHz 31.3 kHz 39.1 kHz 62.5 kHz 78.1 kHz
Note: * Outside the I
2
C bus interface specification range (normal mode: max. 100 kHz; high-speed
mode: max. 400 kHz).