R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 134

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
Figure 13.11 Calculation Formula of UiBRG (i=0 to 1) Register Setting Value
Table 13.7 Bit Rate Setting Example in UART Mode
Bit Rate
14400
19200
28800
31250
38400
51200
1200
2400
4800
9600
(bps)
13.2.3 Bit Rate
Divided-by-16 of frequency by the UiBRG (i=0 to 1) register in UART mode is a bit rate.
Jan 27, 2006
<UART Mode>
• When selecting internal clock
Setting value to the UiBRG register =
• When selecting external clock
Setting value to the UiBRG register =
Count Source
fj : Count source frequency of the UiBRG register (f1SIO, f8SIO and f32SIO)
fEXT : Count source frequency of the UiBRG register (external clock)
BRG
f8
f8
f8
f1
f1
f1
f1
f1
f1
f1
page 123 of 205
BRG Setting Value Actual Time(bps) Error(%)
129 (81
129 (81
64 (40
32 (20
86 (56
64 (40
42 (2A
39 (27
32 (20
23 (17
System Clock = 20MHz
16
16
16
16
16
16
16
16
16
16
)
)
)
)
)
)
)
)
)
)
14367.82
19230.77
29069.77
31250.00
37878.79
52083.33
1201.92
2403.85
4734.85
9615.38
Bit Rate
Bit Rate
fEXT
fj
13.2 Clock Asynchronous Serial I/O (UART) Mode
–1.36
–0.22
–1.36
0.16
0.16
0.16
0.16
0.94
0.00
1.73
16
16
–1
–1
BRG Setting Value Actual Time(bps) Error(%)
51 (33
25 (19
12 (0C
51 (33
34 (22
25 (19
16 (10
15 (0F
12 (0C
9 (09
16
16
16
16
16
16
16
16
16
16
System Clock = 8MHz
)
)
)
)
)
)
)
)
)
)
14285.71
19230.77
29411.76
31250.00
38461.54
50000.00
1201.92
2403.85
4807.69
9615.38
–0.79
–2.34
0.16
0.16
0.16
0.16
0.16
2.12
0.00
0.16