HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 643

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

14.2.8
BRR is an 8-bit register that sets the serial transfer bit rate in accordance with the baud rate
generator operating clock selected by bits CKS1 and CKS0 in SMR.
BRR can be read or written to by the CPU at all times.
BRR is initialized to H'FF by a reset and in hardware standby mode. In software standby mode
and module stop mode it retains its previous state.
As baud rate generator control is performed independently for each channel, different values can
be set for each channel.
Table 14.3 shows sample BRR settings in asynchronous mode, and table 14.4 shows sample BRR
settings in synchronous mode.
Table 14.3 BRR Settings for Various Bit Rates (Asynchronous Mode)
Bit Rate
(bits/s)
110
150
300
600
1200
2400
4800
9600
19200
31250
38400
Bit
Initial value :
R/W
Bit Rate Register (BRR)
:
:
n
1
1
0
0
0
0
0
—
—
0
—
R/W
φ = 2 MHz
7
1
N
141
103
207
103
51
25
12
—
—
1
—
Error
(%)
0.03
0.16
0.16
0.16
0.16
0.16
0.16
—
—
0.00
—
R/W
6
1
n
1
1
0
0
0
0
0
0
—
—
—
φ = 2.097152 MHz
R/W
5
1
N
148
108
217
108
54
26
13
6
—
—
—
Error
(%)
–0.04 1
0.21
0.21
0.21
–0.70 0
1.14
–2.48 0
–2.48 0
—
—
—
R/W
4
1
Rev.4.00 Sep. 07, 2007 Page 613 of 1210
1
0
0
0
—
n
0
0
φ = 2.4576 MHz
R/W
3
1
N
174
127
255
127
63
31
15
7
3
—
1
Error
(%)
–0.26 1
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
—
0.00
R/W
2
1
n
1
1
0
0
0
0
0
0
0
—
REJ09B0245-0400
R/W
1
1
φ = 3 MHz
N
212
155
77
155
77
38
19
9
4
2
—
Error
(%)
0.03
0.16
0.16
0.16
0.16
0.16
–2.34
–2.34
–2.34
0.00
—
R/W
0
1