Table 14-3 Examples of BRR Settings in Asynchronous Mode (4)
XTAL Frequency (MHz)
14.7456 16 19.6608 20
Bit Error Error Error Error
Rate n N (%) n N (%) n N (%) n N (%)
110 2 130 –0.07 2 141 +0.03 2 174 –0.26 3 43 +0.88
150 2 95 0 2 103 +0.16 2 127 0 2 129 +0.16
300 1 191 0 1 207 +0.16 1 255 0 2 64 +0.16
600 1 95 0 1 103 +0.16 1 127 0 1 129 +0.16
1200 0 191 0 0 207 +0.16 0 255 0 1 64 +0.16
2400 0 95 0 0 103 +0.16 0 127 0 0 129 +0.16
4800 0 47 0 0 51 +0.16 0 63 0 0 64 +0.16
9600 0 23 0 0 25 +0.16 0 31 0 0 32 –1.36
19200 0 11 0 0 12 +0.16 0 15 0 0 15 +1.73
31250 — — — 0 7 0 0 9 –1.70 0 9 0
38400 0 5 0 — — — 0 7 0 0 7 +1.73
B = OSC × 10
6
/[64 × 2
2n
× (N + 1)]
B : Bit rate
N : BRR value (0 ≤ N ≤ 255)
OSC : Crystal oscillator frequency in MHz
n : Internal clock source (0, 1, 2, or 3)
The meaning of n is given by the table below:
n CKS1 CKS0 Clock
000ø
1 0 1 ø/4
2 1 0 ø/16
3 1 1 ø/64
257
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