hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 391

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Table 10.3 Examples of BRR Settings for Various Bit Rates (Asynchronous Mode) (2)
Bit Rate
(bit/s)
110
150
200
250
300
600
1200
2400
4800
9600
19200
31250
38400
Notes: No indication: Setting not possible.
—: Setting possible, but errors may result.
1. The value set in BRR is given by the following equation:
2. The error in table 10.3 is the value obtained from the following equation, rounded to two
where
decimal places.
n
3
3
3
3
3
3
3
3
2
2
0
0
0
Error (%) =
N =
5 MHz
N
21
15
11
9
7
3
1
0
1
0
7
4
3
(32 • 2
B: Bit rate (bit/s)
N: Baud rate generator BRR setting (0 ≤ N ≤ 255)
φ: System clock frequency
n: Baud rate generator input clock number (n = 0, 2, or 3)
Error
(%)
0.88
1.73
1.73
–2.34 3
1.73
1.73
1.73
1.73
1.73
173
1.73
0
1.73
B (rate obtained from n, N, OSC) – R(bit rate in left-hand column in table 10.3.)
(The relation between n and the clock is shown in table 10.4.)
φ
2n
• B)
2
0
0
0
0
—
n
3
3
3
3
2
0
– 1
8 MHz
N
35
25
19
15
12
25
12
103 0.16
51
25
12
7
—
φ φ φ φ
R (bit rate in left-hand column in table 10.3.)
Error
(%)
–1.36 3
0.16
–2.34 3
–2.34 3
0.16
0.16
0.16
0.16
0.16
0.16
0
—
n
3
3
3
3
3
3
2
2
0
0
10 MHz
N
43
32
23
19
15
7
3
1
0
1
0
9
7
Section 10 Serial Communication Interface
Rev. 7.00 Mar 10, 2005 page 349 of 652
Error
(%)
0.88
–1.36
1.73
–2.34
1.73
1.73
1.73
1.73
1.73
1.73
1.73
0
1.73
REJ09B0042-0700
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