HD6475348R Datasheet, PDF (283/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

Table 14-4 Examples of BRR Settings in Synchronous Mode
Bit
Rate
100
250
500
1k
2.5k
5k
10k
25k
50k
100k
250k
500k
1M
2.5M
2
nN
——
1 249
1 124
0 249
0 99
0 49
0 24
09
04
——
0 0*
4
nN
——
2 124
1 249
1 124
0 199
0 99
0 49
0 19
09
04
01
0 0*
XTAL Frequency (MHz)
8
10
16
nN
nN
nN
—— —— ——
2 249 — — 3 124
2 124 — — 2 249
1 249 — — 2 124
1 99 1 124 1 199
0 199 0 249 1 99
0 99 0 124 0 199
0 39 0 49 0 79
0 19 0 24 0 39
09
— — 0 19
03
04
07
01
—— 0 3
0 0* — — 0 1
20
nN
——
——
——
——
1 249
1 124
0 249
0 99
0 49
0 24
09
04
——
0 0*
32
nN
——
3 249
3 124
2 249
2 99
1 199
1 99
0 159
0 79
0 39
0 15
07
03
——
Notes: Blank: No setting is available.
—: A setting is available, but the bit rate is inaccurate.
* : Continuous transfer is not possible.
B = OSC/[8 × 2²ⁿ × (N + 1)]
B:
N:
OSC :
n:
Bit rate
BRR value (0 ≤ N ≤ 255)
Crystal oscillator frequency in MHz
Internal clock source (0, 1, 2, or 3)
The meaning of n is given by the table below:
n
CKS1 CKS0 Clock
0
0
0
ø
1
0
1
ø/4
2
1
0
ø/16
3
1
1
ø/64
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