Hitachi H8/3937 Series Hardware Manual page 284

Table 10-6 Examples of BRR Settings for Various Bit Rates (Asynchronous Mode) (2)
OSC
10 MHz
Bit Rate
(bit/s) n N
110 2 88
150 2 64
200 2 48
250 2 38
300 — —
600 — —
1200 0 129
2400 0 64
4800 — —
9600 — —
19200 — —
31250 0 4
38400 — —
Notes: 1. The setting should be made so that the error is not more than 1%.
2. The value set in BRR is given by the following equation:
OSC
N=
(64 × 2
where
B: Bit rate (bit/s)
N: Baud rate generator BRR setting (0 ≤ N ≤ 255)
OSC: Value of ø
n: Baud rate generator input clock number (n = 0, 2, or 3)
(The relation between n and the clock is shown in table 10-7.)
3. The error in table 10-6 is the value obtained from the following equation, rounded to two
decimal places.
B (rate obtained from n, N, OSC) — R (bit rate in left-hand column in table 10-6.)
Error (%) =
272
16 MHz
Error Error
(%) n N (%)
–0.25 2 141 –0.02
0.16 2 103 0.16
–0.35 2 77 0.16
0.16 2 62 –0.79
— 2 51 0.16
— 2 25 0.16
0.16 0 207 0.16
0.16 0 103 0.16
— 0 51 0.16
— 0 25 0.16
— 0 12 0.16
0 0 7 0
— — — —
— 1
× B)
2n
(Hz)
OSC
R (bit rate in left-hand column in table 10-6.)
× 100