368
Table 13.4 Bit Rates and BRR Settings in Synchronous Mode
φ (MHz)
Bit Rate
24 8101620
(bits/s) n N n N n N n N n N n N
110 3 70—————— ————
250 2 124 2 249 3 124 — — 3 249 — —
500 1 249 2 124 2 249 — — 3 124 — —
1k 1 124 1 249 2 124 — — 2 249 — —
2.5k 0 199 1 99 1 199 1 249 2 99 2 124
5k 0 99 0 199 1 99 1 124 1 199 1 249
10k 0 49 0 99 0 199 0 249 1 99 1 124
25k 0 19 0 39 0 79 0 99 0 159 0 199
50k 0 9 0 19 0 39 0 49 0 79 0 99
100k 0 4 0 9 0 19 0 24 0 39 0 49
250k 0 1 0 3 0 7 0 9 0 15 0 19
500k 0 0
*
010304 0709
1M 0 0
*
01——0304
2.5M — — 0 0
*
——0 1
5M ——0 0
*
Blank: No setting available
—: Setting possible, but error occurs
*: Continuous transmission/reception not possible
The BRR setting is calculated as follows:
Asynchronous mode
N = [φ/(64 × 2
2n – 1
× B)] × 10
6
– 1
Synchronous mode
N = [φ/(8 × 2
2n – 1
× B)] × 10
6
– 1
B: Bit rate (bits/s)
N: BRR setting for baud rate generator (0 ≤ N ≤ 255)
φ: φ frequency (MHz)
n: Baud rate generator clock source (n = 0, 1, 2, 3)
For the clock sources and values of n, see following table.
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