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Rev. 2.0, 11/00, page 461 of 1037
The BRR1 setting is found from the following equations.
•
Asynchronous mode:
N=
φ
×
10
6
−
1
64
×
2
2n
−
1
×
B
•
Clock synchronous mode:
N=
φ
×
10
6
−
1
8
×
2
2n
−
1
×
B
Where
B: Bit rate (bits/s)
N: BRR1 setting for baud rate generator (0
≤
N
≤
255)
φ
: Operating frequency (MHz)
n:
Baud rate generator input clock (n = 0 to 3)
(See the table below for the relation between n and the clock.)
SMR1 Setting
n
Clock
CKS1
CKS0
0
φ
0
0
1
φ
/4
0
1
2
φ
/16
1
0
3
φ
/64
1
1
The bit rate error in asynchronous mode is found from the following equation:
Error (%) = {
φ
×
10
6
−
1 }
×
100
(N+1)
×
B
×
64
×
2
2n
−
1
Table 23.5 shows the maximum bit rate for each frequency in asynchronous mode. Tables 23.6
and 23.7 show the maximum bit rates with external clock input.
Содержание Hitachi H8S/2191
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