HD64F2638F20J Datasheet, PDF (607/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Section 15 I²C Bus Interface [Option]
(Only for the H8S/2638, H8S/2639, and H8S/2630)
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
Bit 3
Transfer Rate
φ=
IICX CKS2 CKS1 CKS0 Clock 5 MHz
φ=
8 MHz
φ=
φ=
φ=
10 MHz 16 MHz 20 MHz
0
0
0
0
φ/28 179 kHz 286 kHz 357 kHz 571 kHz^* 714 kHz^*
1
φ/40 125 kHz 200 kHz 250 kHz 400 kHz 500 kHz^*
1
0
φ/48 104 kHz 167 kHz 208 kHz 333 kHz 417 kHz^*
1
φ/64 78.1 kHz 125 kHz 156 kHz 250 kHz 313 kHz
1
0
0
φ/80 62.5 kHz 100 kHz 125 kHz 200 kHz 250 kHz
1
φ/100 50.0 kHz 80.0 kHz 100 kHz 160 kHz 200 kHz
1
0
φ/112 44.6 kHz 71.4 kHz 89.3 kHz 143 kHz 179 kHz
1
φ/128 39.1 kHz 62.5 kHz 78.1 kHz 125 kHz 156 kHz
1
0
0
0
φ/56 89.3 kHz 143 kHz 179 kHz 286 kHz 357 kHz
1
φ/80 62.5 kHz 100 kHz 125 kHz 200 kHz 250 kHz
1
0
φ/96 52.1 kHz 83.3 kHz 104 kHz 167 kHz 208 kHz
1
φ/128 39.1 kHz 62.5 kHz 78.1 kHz 125 kHz 156 kHz
1
0
0
φ/160 31.3 kHz 50.0 kHz 62.5 kHz 100 kHz 125 kHz
1
φ/200 25.0 kHz 40.0 kHz 50.0 kHz 80.0 kHz 100 kHz
1
0
φ/224 22.3 kHz 35.7 kHz 44.6 kHz 71.4 kHz 89.3 kHz
1
φ/256 19.5 kHz 31.3 kHz 39.1 kHz 62.5 kHz 78.1 kHz
Note: * These rates are outside the ranges stipulated in the I²C bus interface specifications (normal
mode: max. 100 kHz, high-speed mode: max. 400 kHz).
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 557 of 1458