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HD6433644R Datasheet(PDF) 324 Page - Renesas Technology Corp

Part # HD6433644R
Description  8-Bit Single-Chip Microcomputer
PDF  549 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433644R Datasheet(HTML) 324 Page - Renesas Technology Corp

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Section 10 Serial Communication Interface
Rev. 6.00 Sep 12, 2006 page 304 of 526
REJ09B0326-0600
Bit Rate Register (BRR)
Bit
7
6
5
4
3
2
1
0
BRR7
BRR6
BRR5
BRR4
BRR3
BRR2
BRR1
BRR0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BRR is an 8-bit register that designates the transmit/receive bit rate in accordance with the baud
rate generator operating clock selected by bits CKS1 and CKS0 of the serial mode register (SMR).
BRR can be read or written by the CPU at any time.
BRR is initialized to H'FF upon reset, and in standby, watch, subactive, or subsleep mode.
Table 10.6 shows examples of BRR settings in asynchronous mode. The values shown are for
active (high-speed) mode.
Table 10.6 Examples of BRR Settings for Various Bit Rates (Asynchronous Mode)
OSC (MHz)
2
2.4576
4
4.194304
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
110
1
70
+0.03
1
86
+0.31
1
141 +0.03
1
148 –0.04
150
0
207 +0.16
0
255 0
1
103 +0.16
1
108 +0.21
300
0
103 +0.16
0
127 0
0
207 +0.16
0
217 +0.21
600
0
51
+0.16
0
63
0
0
103 +0.16
0
108 +0.21
1200
0
25
+0.16
0
31
0
0
51
+0.16
0
54
–0.70
2400
0
12
+0.16
0
15
0
0
25
+0.16
0
26
+1.14
4800
0
7
0
0
12
+0.16
0
13
–2.48
9600
0
3
0
0
6
–2.48
19200
0
1
0
31250
0
0
0
0
1
0
38400
0
0
0



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