Datasheet

Section 12 Serial Communication Interface
Rev.7.00 Dec. 24, 2008 Page 389 of 698
REJ09B0074-0700
12345678910 123 45 678
11 12 13 14 15 16 17 18 19 20 21 2322 2425 1 2 5 6 7 8 9 1011121314151617181920212223242534
8 MHz
7.3725 MHz
12345678910 11 12 13 14 15 16 17 12345678910 11 12 13 14 15 16
18 19 20 21 2322 24 25 26 27 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 1 2 3 4 5 6 7 828 29
8 MHz 8 MHz
7.3725 MHz
12345678910 11 12 13 14 15 16 17 12345678
18 19 20 21 2322 24 25 26 27 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 1 2 3 4 5 6 7 828 29
5.76 MHz
123
2 MHz
1.8431 MHz
456789
10 11 12 13 14 15 16 17
12345678910 11 12 13 14 15 16
18 19 20 21 2322 24 25 26 27 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 1 2 3 4 5 6 7 828 29
Base clock
16 MHz/2 = 8 MHz
8 MHz × (18/25)
= 5.76 MHz
(Average)
Base clock with 720-kbps average transfer rate (ACS3 to ACS0 = B'0111)
Average transfer rate = 5.76 MHz/8 = 720 kbps Average error with 720 kbps = ±0%
Base clock
16 MHz/2 = 8 MHz
8 MHz × (47/51)
= 7.3725 MHz
(Average)
Base clock with 921.569-kbps average transfer rate (ACS3 to ACS0 = B'0011)
Average transfer rate = 7.3725 MHz/8 = 921.569 kbps Average error with 921.6 kbps = -0.003%
Note: * The lengh of one bit varies according to the base clock synchronization.
Base clock
16 MHz/2 = 8 MHz
8 MHz × (47/51)
= 7.3725 MHz
(Average)
1 bit = base clock × 16*
1 bit = base clock × 8*
1 bit = base clock × 8*
Base clock with 460.784-kbps average transfer rate (ACS3 to ACS0 = B'0110)
Average transfer rate = 7.3725 MHz/16 = 460.784 kbps Average error with 460.8 kbps = -0.004%
1 bit = base clock × 16*
Base clock
16 MHz/8 = 2 MHz
2 MHz × (47/51)
= 1.8431 MHz
(Average)
When φ = 16 MHz Base clock with 115.196-kbps average transfer rate (ACS3 to ACS0 = B'0101)
Average transfer rate = 1.8431 MHz/16 = 115.196 kbps Average error with 115.2 kbps = -0.004%
Figure 12.3 Examples of Base Clock when Average Transfer Rate Is Selected (2)