Hitachi H8/500 Series - Examples of BRR Settings in Synchronous Mode

Table 14-4 Examples of BRR Settings in Synchronous Mode
XTAL Frequency (MHz)
Bit 2 4 8 10 16 20
Rate n N n N n N n N n N n N
100 ————————————
250 1 249 2 124 2 249 — — 3 124 — —
500 1 124 1 249 2 124 — — 2 249 — —
1K 0 249 1 124 1 249 — — 2 124 — —
2.5M 0 99 0 199 1 99 1 124 1 199 1 249
5K 0 49 0 99 0 199 0 249 1 99 1 124
10K 0 24 0 49 0 99 0 124 0 199 0 249
25K09019039049079099
50K0409019024039049
100K — — 0409——019024
250K 000103040709
500K 0001——0304
1M 00——01——
2.5M 00
Notes:
Blank: No setting is available.
—: A setting is available, but the bit rate is inaccurate.
B = OSC/[8 × 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
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